2008-07-01 to 2008-10-01 (76 threads) 2008-04-01 to 2008-07-01 (54 threads) 2008-01-01 to 2008-04-01 (65 threads) 2007-10-01 to 2008-01-01 (58 threads) 2007-07-01 to 2007-10-01 (59 threads) 2007-04-01 to 2007-07-01 (54 threads) 2007-01-01 to 2007-04-01 (47 threads) 2006-10-01 to 2007-01-01 (55 threads) 2006-07-01 to 2006-10-01 (75 threads) 2006-04-01 to 2006-07-01 (73 threads) 2006-01-01 to 2006-04-01 (83 threads) 2005-10-01 to 2006-01-01 (50 threads)