http://www.heritage.org/research/features/index/ChapterPDFs/2001_Exec_Sum.PDF has been crawled 46 times going all the way back to January 11, 2004.

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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Note

This calendar view maps the number of times http://www.heritage.org/research/features/index/ChapterPDFs/2001_Exec_Sum.PDF was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.