http://www.nei.nih.gov/health/diabetic/retinopathy.htm has been crawled 51 times going all the way back to August 5, 2002.
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.nei.nih.gov/health/diabetic/retinopathy.htm was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.