Quarter	US dollars
1999-09-30	0
1999-12-31	0
2000-03-31	9028
2000-06-30	9822
2000-09-30	8382
2000-12-31	9102
2001-03-31	9084
2001-06-30	9791
2001-09-30	9450
2001-12-31	10302
2002-03-31	11737
2002-06-30	13149
2002-09-30	14355
2002-12-31	15800
2003-03-31	17134
2003-06-30	18809
2003-09-30	18171
2003-12-31	20515
2004-03-31	20245
2004-06-30	22041
2004-09-30	24651
2004-12-31	26169
2005-03-31	29544
2005-06-30	31717
2005-09-30	31431
2005-12-31	30509
2006-03-31	30245
2006-06-30	30028
2006-09-30	30231
2006-12-31	32149
2007-03-31	30484
2007-06-30	41933
2007-09-30	35507
2007-12-31	40304
2008-03-31	42893
2008-06-30	26555
2008-09-30	58424
2008-12-31	49370
2009-03-31	33478
2009-06-30	24868
2009-09-30	22138
2009-12-31	17898
2010-03-31	24813
2010-06-30	24240
2010-09-30	24409
2010-12-31	27498
2011-03-31	28787
2011-06-30	23730
2011-09-30	28556
2011-12-31	27736
2012-03-31	26575
2012-06-30	26800
2012-09-30	27650
2012-12-31	29047
2013-03-31	25108
2013-06-30	24655
2013-09-30	24711
2013-12-31	24408
2014-03-31	25976
2014-06-30	26386
2014-09-30	25901
2014-12-31	25379
2015-03-31	25498
2015-06-30	24965
2015-09-30	25462
2015-12-31	25394
2016-03-31	25489
2016-06-30	25127
2016-09-30	25554
2016-12-31	21963
2017-03-31	19953
2017-06-30	22019
2017-09-30	24877
2017-12-31	25643
2018-03-31	26718
2018-06-30	24864
2018-09-30	20712
2018-12-31	20788
2019-03-31	19204
2019-06-30	21658
2019-09-30	23940
2019-12-31	25590
2020-03-31	22239
2020-06-30	29755
2020-09-30	34550
2020-12-31	36443
2021-03-31	34165
2021-06-30	27187
2021-09-30	27772
2021-12-31	35475
2022-03-31	30964
2022-06-30	26482
2022-09-30	20679
2022-12-31	22601
2023-03-31	24575
2023-06-30	22549
2023-09-30	21697
2023-12-31	23563