http://www.cas.cz has been crawled 542x. going all the way back to 3. September 2001.
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.cas.cz was crawled, not how many times the site was actually updated. More info in the documentation.