Quarter US dollars 2004-12-31 164781 2005-03-31 167582 2005-06-30 168549 2005-09-30 169278 2005-12-31 171045 2006-03-31 173823 2006-06-30 178732 2006-09-30 190293 2006-12-31 193117 2007-03-31 200476 2007-06-30 202197 2007-09-30 224383 2007-12-31 210311 2008-03-31 224955 2008-06-30 232523 2008-09-30 236265 2008-12-31 250216 2009-03-31 257981 2009-06-30 284136 2009-09-30 293681 2009-12-31 302428 2010-03-31 293042 2010-06-30 305041 2010-09-30 334551 2010-12-31 343612 2011-03-31 365417 2011-06-30 366917 2011-09-30 369912 2011-12-31 368275 2012-03-31 374793 2012-06-30 378872 2012-09-30 386337 2012-12-31 405922 2013-03-31 408005 2013-06-30 403747 2013-09-30 424989 2013-12-31 433774 2014-03-31 438485 2014-06-30 447290 2014-09-30 450880 2014-12-31 443055 2015-03-31 444757 2015-06-30 460918 2015-09-30 461356 2015-12-31 435806 2016-03-31 433694 2016-06-30 445649 2016-09-30 449117 2016-12-31 444797 2017-03-31 451590 2017-06-30 462491 2017-09-30 474545 2017-12-31 487607 2018-03-31 490748 2018-06-30 502898 2018-09-30 509065 2018-12-31 518369 2019-03-31 512543 2019-06-30 535289 2019-09-30 535820 2019-12-31 546924 2020-03-31 546157 2020-06-30 566558 2020-09-30 589051 2020-12-31 592008 2021-03-31 593040 2021-06-30 608311 2021-09-30 606594 2021-12-31 592550 2022-03-31 609348 2022-06-30 615126 2022-09-30 611967 2022-12-31 611737 2023-03-31 615303 2023-06-30 606334 2023-09-30 596142