2008-04-01 to 2008-07-01 (185 threads) 2008-01-01 to 2008-04-01 (147 threads) 2007-10-01 to 2008-01-01 (157 threads) 2007-07-01 to 2007-10-01 (161 threads) 2007-04-01 to 2007-07-01 (146 threads) 2007-01-01 to 2007-04-01 (161 threads) 2006-10-01 to 2007-01-01 (205 threads) 2006-07-01 to 2006-10-01 (203 threads) 2006-04-01 to 2006-07-01 (177 threads) 2006-01-01 to 2006-04-01 (191 threads) 2005-10-01 to 2006-01-01 (187 threads) 2005-07-01 to 2005-10-01 (172 threads) 2005-04-01 to 2005-07-01 (177 threads)