We have now updated our Historic Index with data for start of May 2013. Here are the new stats:
Historic Index –
Unique Pages crawled: 472,383,604,906
Unique URLs: 3,584,026,567,247
Date range: 07 Oct 2007 to 08 May 2013
There is an increase in unique crawled pages but reduction of unique URLs due to roll out of quality improvement algorithm used initially in Fresh index.