Quarter	US dollars
1999-03-31	34463
1999-06-30	38525
1999-09-30	39660
1999-12-31	32380
2000-03-31	42486
2000-06-30	44712
2000-09-30	44899
2000-12-31	44100
2001-03-31	44087
2001-06-30	43493
2001-09-30	43589
2001-12-31	49876
2002-03-31	48842
2002-06-30	43144
2002-09-30	49799
2002-12-31	53836
2003-03-31	51286
2003-06-30	52754
2003-09-30	52093
2003-12-31	59354
2004-03-31	66372
2004-06-30	64432
2004-09-30	70673
2004-12-31	83042
2005-03-31	81445
2005-06-30	77903
2005-09-30	69377
2005-12-31	66058
2006-03-31	67111
2006-06-30	73641
2006-09-30	75137
2006-12-31	82846
2007-03-31	83717
2007-06-30	83652
2007-09-30	93588
2007-12-31	97131
2008-03-31	89795
2008-06-30	87588
2008-09-30	91803
2008-12-31	91613
2009-03-31	73975
2009-06-30	83055
2009-09-30	78638
2009-12-31	67614
2010-03-31	66181
2010-06-30	54238
2010-09-30	59192
2010-12-31	50193
2011-03-31	47174
2011-06-30	50390
2011-09-30	55141
2011-12-31	58153
2012-03-31	55215
2012-06-30	60886
2012-09-30	64013
2012-12-31	63617
2013-03-31	54208
2013-06-30	54631
2013-09-30	49670
2013-12-31	57835
2014-03-31	36686
2014-06-30	44672
2014-09-30	52802
2014-12-31	46502
2015-03-31	40869
2015-06-30	35025
2015-09-30	37442
2015-12-31	38331
2016-03-31	36479
2016-06-30	34560
2016-09-30	43517
2016-12-31	40550
2017-03-31	32547
2017-06-30	31488
2017-09-30	36842
2017-12-31	36708
2018-03-31	48213
2018-06-30	47178
2018-09-30	32084
2018-12-31	42978
2019-03-31	38588
2019-06-30	45924
2019-09-30	40947
2019-12-31	48323
2020-03-31	53584
2020-06-30	51390
2020-09-30	61506
2020-12-31	61424
2021-03-31	60487
2021-06-30	65580
2021-09-30	77492
2021-12-31	87253
2022-03-31	108381
2022-06-30	105083
2022-09-30	125884
2022-12-31	107243
2023-03-31	93969
2023-06-30	92004
2023-09-30	88068