2008-04-01 to 2008-07-01 (222 threads) 2008-01-01 to 2008-04-01 (213 threads) 2007-10-01 to 2008-01-01 (261 threads) 2007-07-01 to 2007-10-01 (233 threads) 2007-04-01 to 2007-07-01 (219 threads) 2007-01-01 to 2007-04-01 (175 threads) 2006-10-01 to 2007-01-01 (172 threads) 2006-07-01 to 2006-10-01 (202 threads) 2006-04-01 to 2006-07-01 (263 threads) 2006-01-01 to 2006-04-01 (226 threads) 2005-10-01 to 2006-01-01 (134 threads)