2011 forum stats (no pageview stats):
Monthly Summary New Topics New Posts New Members Most Online
July 2011 6697 107909 5466 1453
June 2011 12279 152375 14483 3809
May 2011 4034 55331 5959 1931
2013 forum stats:
Monthly Summary New Topics New Posts New Members Most Online Page views
April 2013 11690 159824 11360 7150 25228708
March 2013 9614 142393 7358 4824 22159538
February 2013 4512 72812 3532 1489 12448863
https://bitcointalk.org/index.php?action=stats