Quarter	US dollars
1999-03-31	121865
1999-06-30	161165
1999-09-30	159318
1999-12-31	134139
2000-03-31	149046
2000-06-30	165240
2000-09-30	178830
2000-12-31	204718
2001-03-31	212019
2001-06-30	201905
2001-09-30	214741
2001-12-31	260029
2002-03-31	244490
2002-06-30	258841
2002-09-30	250223
2002-12-31	238559
2003-03-31	235368
2003-06-30	267978
2003-09-30	246771
2003-12-31	228167
2004-03-31	257737
2004-06-30	265465
2004-09-30	267404
2004-12-31	267232
2005-03-31	295076
2005-06-30	340736
2005-09-30	348220
2005-12-31	355424
2006-03-31	403747
2006-06-30	352492
2006-09-30	328446
2006-12-31	402241
2007-03-31	400902
2007-06-30	376439
2007-09-30	452376
2007-12-31	441422
2008-03-31	590761
2008-06-30	375912
2008-09-30	453885
2008-12-31	425942
2009-03-31	444796
2009-06-30	491186
2009-09-30	498077
2009-12-31	541375
2010-03-31	583903
2010-06-30	564357
2010-09-30	570264
2010-12-31	623534
2011-03-31	545272
2011-06-30	498208
2011-09-30	605334
2011-12-31	600286
2012-03-31	564947
2012-06-30	524507
2012-09-30	574347
2012-12-31	545403
2013-03-31	501695
2013-06-30	437528
2013-09-30	387255
2013-12-31	409676
2014-03-31	347533
2014-06-30	335008
2014-09-30	351447
2014-12-31	321439
2015-03-31	272816
2015-06-30	299908
2015-09-30	259817
2015-12-31	320350
2016-03-31	364709
2016-06-30	330888
2016-09-30	273902
2016-12-31	288074
2017-03-31	294903
2017-06-30	308181
2017-09-30	285829
2017-12-31	323455
2018-03-31	328791
2018-06-30	285130
2018-09-30	252432
2018-12-31	233231
2019-03-31	355932
2019-06-30	355432
2019-09-30	385369
2019-12-31	352664
2020-03-31	418265
2020-06-30	435553
2020-09-30	431311
2020-12-31	512181
2021-03-31	568905
2021-06-30	541755
2021-09-30	556673
2021-12-31	542900
2022-03-31	619788
2022-06-30	615301
2022-09-30	574476
2022-12-31	541858
2023-03-31	609102
2023-06-30	587657
2023-09-30	590658