http://www.post-gazette.com/pg/07331/836964-28.stm has been crawled 12 times going all the way back to May 19, 2007.

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.post-gazette.com/pg/07331/836964-28.stm was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.