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It's not terribly common for companies to see revenue drop by double-digit percentages, but in coming up with entries for its list of America's fastest-shrinking companies, 24/7 Wall St. found that sometimes the plunges came fast and furious, with revenue for a few companies falling more than one-third in just three years. The site picked out the S&P 500 companies that suffered the most from fiscal 2012 to fiscal 2015, and they share one similarity: They're all oil companies. The seven with the most drastic three-year declines:

1. Apache, -61.4%
2. Marathon Oil Corporation, -53.3%
3. ConocoPhillips, -49.7%
4. Phillips 66, -48.7%
5. Hess, -45.7%
6. Chevron Corporation, -44.9%
7. Exxon Mobil Corporation, -43.5%

Check out 24/7 Wall St. for more companies that made the cut. (Or the five worst car brands in the US.)