To succeed in the U.S. economy, companies must constantly adapt to changing conditions. Though some of the nation’s largest corporations — companies such as General Electric, Exxon Mobil, and Walmart — have always dominated, for many American consumers the landscape of companies has shifted over the course of their lifetimes.

Though industrial companies used to be among the largest in terms of revenue, in the more modern era internet and tech giants like Google, Apple, and Amazon, are decisively making their way toward the top of the list.

24/7 Wall St. reviewed annual revenue figures for the nation’s largest 500 companies in each year from 1955 to 2016 — figures came from business magazine Fortune. General Motors was the nation’s largest company throughout the 1950s, ‘60s, and part of the ‘70s. Exxon Mobil edged out the automaker in 1975, but GM returned to the No. 1 position periodically in subsequent years.

Since 2001, either Walmart or Exxon Mobil has occupied the top spot. With revenue of $496 billion in its most recent fiscal year, the global retailing giant is the world’s largest company by revenue.

Because these are the country’s largest companies, any meaningful deterioration in size — rather than simply in response to cyclical economic and sectoral forces — usually takes years, if not decades to manifest. Gradual changes in size over the longer term among Fortune 500 companies reflect larger trends in the U.S. economy. For example, the decline of automobile company GM and the rise of retailer Walmart over the past 50 years reflect the decline of American manufacturing and the rise of the service sector over that time.

To identify the largest companies in the year you were born, 24/7 Wall St. reviewed annual revenue figures for companies on the Fortune 500 each year from 1955 through 2016. For every year since 1955, the top five companies by revenue are listed.

Click here to see the biggest company the year you were born.

1. General Motors: $9.82 billion
2. Exxon Mobil: $5.66 billion
3. U.S. Steel: $3.25 billion
4. General Electric: $2.96 billion
5. Esmark: $2.51 billion

1. General Motors: $12.44 billion
2. Exxon Mobil: $6.27 billion
3. Ford Motor: $5.59 billion
4. U.S. Steel: $4.10 billion
5. Chrysler: $3.47 billion

1. General Motors: $10.80 billion
2. Exxon Mobil: $7.13 billion
3. Ford Motor: $4.65 billion
4. U.S. Steel: $4.23 billion
5. General Electric: $4.09 billion

1. General Motors: $10.99 billion
2. Exxon Mobil: $7.83 billion
3. Ford Motor: $5.77 billion
4. U.S. Steel: $4.41 billion
5. General Electric: $4.34 billion

1. General Motors: $9.52 billion
2. Exxon Mobil: $7.54 billion
3. Ford Motor: $4.13 billion
4. General Electric: $4.12 billion
5. U.S. Steel: $3.47 billion

1. General Motors: $11.23 billion
2. Exxon Mobil: $7.91 billion
3. Ford Motor: $5.36 billion
4. General Electric: $4.35 billion
5. U.S. Steel: $3.64 billion

1. General Motors: $12.74 billion
2. Exxon Mobil: $8.04 billion
3. Ford Motor: $5.24 billion
4. General Electric: $4.20 billion
5. U.S. Steel: $3.70 billion

1. General Motors: $11.40 billion
2. Exxon Mobil: $8.44 billion
3. Ford Motor: $6.71 billion
4. General Electric: $4.46 billion
5. Mobil: $3.32 billion

1. General Motors: $14.64 billion
2. Exxon Mobil: $9.54 billion
3. Ford Motor: $8.09 billion
4. General Electric: $4.79 billion
5. Mobil: $3.93 billion

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1. General Motors: $16.50 billion
2. Exxon Mobil: $10.26 billion
3. Ford Motor: $8.74 billion
4. General Electric: $4.92 billion
5. Mobil: $4.35 billion

1. General Motors: $17.00 billion
2. Exxon Mobil: $10.82 billion
3. Ford Motor: $9.67 billion
4. General Electric: $4.94 billion
5. Mobil: $4.50 billion

1. General Motors: $20.73 billion
2. Ford Motor: $11.54 billion
3. Exxon Mobil: $11.47 billion
4. General Electric: $6.21 billion
5. Chrysler: $5.30 billion

1. General Motors: $20.21 billion
2. Ford Motor: $12.24 billion
3. Exxon Mobil: $12.19 billion
4. General Electric: $7.18 billion
5. Chrysler: $5.65 billion

1. General Motors: $20.03 billion
2. Exxon Mobil: $13.27 billion
3. Ford Motor: $10.52 billion
4. General Electric: $7.74 billion
5. Chrysler: $6.21 billion

1. General Motors: $22.76 billion
2. Exxon Mobil: $14.09 billion
3. Ford Motor: $14.08 billion
4. General Electric: $8.38 billion
5. Chrysler: $7.45 billion

1. General Motors: $24.30 billion
2. Exxon Mobil: $14.93 billion
3. Ford Motor: $14.76 billion
4. General Electric: $8.45 billion
5. International Business Machines: $7.20 billion

1. General Motors: $18.75 billion
2. Exxon Mobil: $16.55 billion
3. Ford Motor: $14.98 billion
4. General Electric: $8.73 billion
5. International Business Machines: $7.50 billion

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1. General Motors: $28.26 billion
2. Exxon Mobil: $18.70 billion
3. Ford Motor: $16.43 billion
4. General Electric: $9.43 billion
5. International Business Machines: $8.27 billion

1. General Motors: $30.44 billion
2. Exxon Mobil: $20.31 billion
3. Ford Motor: $20.19 billion
4. General Electric: $10.24 billion
5. Chrysler: $9.76 billion

1. General Motors: $35.80 billion
2. Exxon Mobil: $25.72 billion
3. Ford Motor: $23.02 billion
4. Chrysler: $11.77 billion
5. General Electric: $11.58 billion

1. Exxon Mobil: $42.06 billion
2. General Motors: $31.55 billion
3. Ford Motor: $23.62 billion
4. Texaco: $23.26 billion
5. Mobil: $18.93 billion

1. Exxon Mobil: $44.87 billion
2. General Motors: $35.73 billion
3. Texaco: $24.51 billion
4. Ford Motor: $24.01 billion
5. Mobil: $20.62 billion

1. Exxon Mobil: $48.63 billion
2. General Motors: $47.18 billion
3. Ford Motor: $28.84 billion
4. Texaco: $26.45 billion
5. Mobil: $26.06 billion

1. General Motors: $54.96 billion
2. Exxon Mobil: $54.13 billion
3. Ford Motor: $37.84 billion
4. Mobil: $32.13 billion
5. Texaco: $27.92 billion

1. General Motors: $63.22 billion
2. Exxon Mobil: $60.34 billion
3. Ford Motor: $42.78 billion
4. Mobil: $34.74 billion
5. Texaco: $28.61 billion

1. Exxon Mobil: $79.11 billion
2. General Motors: $66.31 billion
3. Mobil: $44.72 billion
4. Ford Motor: $43.51 billion
5. Texaco: $38.35 billion

1. Exxon Mobil: $103.14 billion
2. Mobil: $59.51 billion
3. General Motors: $57.73 billion
4. Texaco: $51.20 billion
5. Chevron: $40.48 billion

1. Exxon Mobil: $108.11 billion
2. Mobil: $64.49 billion
3. General Motors: $62.70 billion
4. Texaco: $57.63 billion
5. Chevron: $44.22 billion

1. Exxon Mobil: $97.17 billion
2. General Motors: $60.03 billion
3. Mobil: $59.95 billion
4. Texaco: $46.99 billion
5. Ford Motor: $37.07 billion

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1. Exxon Mobil: $88.56 billion
2. General Motors: $74.58 billion
3. Mobil: $54.61 billion
4. Ford Motor: $44.46 billion
5. International Business Machines: $40.18 billion

1. Exxon Mobil: $90.85 billion
2. General Motors: $83.89 billion
3. Mobil: $56.05 billion
4. Ford Motor: $52.37 billion
5. Texaco: $47.33 billion

1. General Motors: $96.37 billion
2. Exxon Mobil: $86.67 billion
3. Mobil: $55.96 billion
4. Ford Motor: $52.77 billion
5. International Business Machines: $50.06 billion

1. General Motors: $102.81 billion
2. Exxon Mobil: $69.89 billion
3. Ford Motor: $62.72 billion
4. International Business Machines: $51.25 billion
5. Mobil: $44.87 billion

1. General Motors: $101.78 billion
2. Exxon Mobil: $76.42 billion
3. Ford Motor: $71.64 billion
4. International Business Machines: $54.22 billion
5. Mobil: $51.22 billion

1. General Motors: $121.09 billion
2. Ford Motor: $92.45 billion
3. Exxon Mobil: $79.56 billion
4. International Business Machines: $59.68 billion
5. General Electric: $49.41 billion

1. General Motors: $126.97 billion
2. Ford Motor: $96.93 billion
3. Exxon Mobil: $86.66 billion
4. International Business Machines: $63.44 billion
5. General Electric: $55.26 billion

1. General Motors: $125.13 billion
2. Exxon Mobil: $105.89 billion
3. Ford Motor: $98.28 billion
4. International Business Machines: $69.02 billion
5. Mobil: $58.77 billion

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1. General Motors: $123.78 billion
2. Exxon Mobil: $103.24 billion
3. Ford Motor: $88.96 billion
4. International Business Machines: $65.39 billion
5. General Electric: $60.24 billion

1. General Motors: $132.78 billion
2. Exxon Mobil: $103.55 billion
3. Ford Motor: $100.79 billion
4. International Business Machines: $65.10 billion
5. General Electric: $62.20 billion

1. General Motors: $133.62 billion
2. Ford Motor: $108.52 billion
3. Exxon Mobil: $97.83 billion
4. International Business Machines: $62.72 billion
5. General Electric: $60.82 billion

1. General Motors: $154.95 billion
2. Ford Motor: $128.44 billion
3. Exxon Mobil: $101.46 billion
4. Wal-Mart Stores: $83.41 billion
5. AT&T: $75.09 billion

1. General Motors: $168.83 billion
2. Ford Motor: $137.14 billion
3. Exxon Mobil: $110.01 billion
4. Wal-Mart Stores: $93.63 billion
5. AT&T: $79.61 billion

1. General Motors: $168.37 billion
2. Ford Motor: $146.99 billion
3. Exxon Mobil: $119.43 billion
4. Wal-Mart Stores: $106.15 billion
5. General Electric: $79.18 billion

1. General Motors: $178.17 billion
2. Ford Motor: $153.63 billion
3. Exxon Mobil: $122.38 billion
4. Wal-Mart Stores: $119.30 billion
5. General Electric: $90.84 billion

1. General Motors: $161.32 billion
2. Ford Motor: $144.42 billion
3. Wal-Mart Stores: $139.21 billion
4. Exxon Mobil: $100.70 billion
5. General Electric: $100.47 billion

1. General Motors: $189.06 billion
2. Wal-Mart Stores: $166.81 billion
3. Exxon Mobil: $163.88 billion
4. Ford Motor: $162.56 billion
5. General Electric: $111.63 billion

1. Exxon Mobil: $210.39 billion
2. Wal-Mart Stores: $193.30 billion
3. General Motors: $184.63 billion
4. Ford Motor: $180.60 billion
5. General Electric: $129.85 billion

1. Wal-Mart Stores: $219.81 billion
2. Exxon Mobil: $191.58 billion
3. General Motors: $177.26 billion
4. Ford Motor: $162.41 billion
5. Enron: $138.72 billion

1. Wal-Mart Stores: $246.53 billion
2. General Motors: $186.76 billion
3. Exxon Mobil: $182.47 billion
4. Ford Motor: $163.63 billion
5. General Electric: $131.70 billion

1. Wal-Mart Stores: $258.68 billion
2. Exxon Mobil: $213.20 billion
3. General Motors: $195.65 billion
4. Ford Motor: $164.50 billion
5. General Electric: $134.19 billion

1. Wal-Mart Stores: $288.19 billion
2. Exxon Mobil: $270.77 billion
3. General Motors: $193.52 billion
4. Ford Motor: $172.23 billion
5. General Electric: $152.36 billion

1. Exxon Mobil: $339.94 billion
2. Wal-Mart Stores: $315.65 billion
3. General Motors: $192.60 billion
4. Chevron: $189.48 billion
5. Ford Motor: $177.21 billion

1. Wal-Mart Stores: $351.14 billion
2. Exxon Mobil: $347.25 billion
3. General Motors: $207.35 billion
4. Chevron: $200.57 billion
5. ConocoPhillips: $172.45 billion

1. Wal-Mart Stores: $378.80 billion
2. Exxon Mobil: $372.82 billion
3. Chevron: $210.78 billion
4. General Motors: $182.35 billion
5. ConocoPhillips: $178.56 billion

1. Exxon Mobil: $442.85 billion
2. Wal-Mart Stores: $405.61 billion
3. Chevron: $263.16 billion
4. ConocoPhillips: $230.76 billion
5. General Electric: $183.21 billion

1. Wal-Mart Stores: $408.21 billion
2. Exxon Mobil: $284.65 billion
3. Chevron: $163.53 billion
4. General Electric: $156.78 billion
5. Bank of America Corp.: $150.45 billion

1. Wal-Mart Stores: $421.85 billion
2. Exxon Mobil: $354.67 billion
3. Chevron: $196.34 billion
4. ConocoPhillips: $184.97 billion
5. Fannie Mae: $153.83 billion

1. Exxon Mobil: $452.93 billion
2. Wal-Mart Stores: $446.95 billion
3. Chevron: $245.62 billion
4. ConocoPhillips: $237.27 billion
5. General Motors: $150.28 billion

1. Wal-mart Stores: $469.16 billion
2. Exxon Mobil Corporation: $449.89 billion
3. Chevron Corporation: $233.90 billion
4. Phillips 66: $169.55 billion
5. Berkshire Hathaway Inc.: $162.46 billion

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1. Wal-mart Stores: $476.29 billion
2. Exxon Mobil Corporation: $407.67 billion
3. Chevron Corporation: $220.36 billion
4. Berkshire Hathaway Inc.: $182.15 billion
5. Apple, Inc.: $170.91 billion

1. Wal-mart Stores: $485.65 billion
2. Exxon Mobil Corporation: $382.60 billion
3. Chevron Corporation: $203.78 billion
4. Berkshire Hathaway Inc.: $194.67 billion
5. Apple, Inc.: $182.80 billion

1. Wal-mart Stores: $485.87 billion
2. Berkshire Hathaway: $223.60 billion
3. Apple: $215.64 billion
4. Exxon Mobil: $205.00 billion
5. McKesson: $192.49 billion

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