http://www.brookings.edu/press/books/schoolchoicepolicydesign.htm has been crawled 153 times going all the way back to May 25, 2005.
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.brookings.edu/press/books/schoolchoicepolicydesign.htm was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.