http://en.wikipedia.org/wiki/American_football has been crawled 321 times going all the way back to December 5, 2003.

A crawl can be a duplicate of the last one. It happens about 25% of the time across 420,000,000 websites. FAQ
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January 4, 2011

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Feb
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February 4, 2011

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February 7, 2011

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February 11, 2011

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February 19, 2011

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February 24, 2011

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February 25, 2011

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February 26, 2011

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February 28, 2011

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Mar

March 1, 2011

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March 4, 2011

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March 5, 2011

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March 9, 2011

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March 17, 2011

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March 22, 2011

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March 29, 2011

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Apr

April 1, 2011

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April 16, 2011

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April 19, 2011

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April 22, 2011

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May
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May 4, 2011

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May 7, 2011

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May 28, 2011

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Jun
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June 8, 2011

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June 21, 2011

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Jul
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July 12, 2011

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July 13, 2011

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July 14, 2011

6 snapshots

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July 15, 2011

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July 16, 2011

2 snapshots

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July 17, 2011

1 snapshot

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July 18, 2011

1 snapshot

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Aug
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Sep
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Oct
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Nov
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Dec
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Note

This calendar view maps the number of times http://en.wikipedia.org/wiki/American_football was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.