I have been wondering (a lot…) recently how often Google has actually updated PageRank. Well, according to one or two sources, here is the answer. And if anyone can make any sense out of the list, I would be keen to know. All that I can say is that there are a lot less updates than there were several years ago!

2010
April 3rd

2009
December 30th
October 30th
June 25th
May 27th
April 1st

2008
December 31st
September 26th
July 25th
April 30th
February 29th

2007
December 12th
October 28th
April 30th
January 25th
January 10th

2006
September 28th
July 30th
May 27th
April 7th
April 4th
February 18th
January 30th
January 4th

2005
December 19th
November 4th
October 27th
October 19th
October 15th
September 4th
July 25th
July 15th
June 11th
June 8th
May 27th
May 24th
April 22nd
March 4th
March 3rd
February 23rd
February 4th
February 3rd
January10th
January 1st

2004
December 26th
November 25th
October 28th
October 18th
October 17th
October 16th
October 6th
September 10th
September 8th
August 30th
August 10th
August 9th
July 16th
June 22nd
May 31st
April 23rd
April 7th
March 16th
February 11th
January 26th
January 11th

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