http://Books.google.co.uk has been crawled 443 times going all the way back to November 24, 2005.

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

Jan
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January 6, 2013

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January 12, 2013

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January 20, 2013

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January 27, 2013

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February 10, 2013

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February 24, 2013

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March 24, 2013

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March 31, 2013

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Jun
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Jul
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Aug
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Sep
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Oct
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Nov
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Note

This calendar view maps the number of times http://Books.google.co.uk was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.