Quarter	US dollars
1999-09-30	18414
1999-12-31	17808
2000-03-31	17875
2000-06-30	20375
2000-09-30	22206
2000-12-31	24897
2001-03-31	23331
2001-06-30	21801
2001-09-30	22272
2001-12-31	20920
2002-03-31	21931
2002-06-30	25310
2002-09-30	23973
2002-12-31	27020
2003-03-31	26590
2003-06-30	27328
2003-09-30	27561
2003-12-31	29052
2004-03-31	29126
2004-06-30	28948
2004-09-30	29505
2004-12-31	33113
2005-03-31	30106
2005-06-30	29483
2005-09-30	29755
2005-12-31	30050
2006-03-31	29757
2006-06-30	31168
2006-09-30	29679
2006-12-31	29950
2007-03-31	30165
2007-06-30	28057
2007-09-30	32638
2007-12-31	36521
2008-03-31	40265
2008-06-30	37539
2008-09-30	34411
2008-12-31	35446
2009-03-31	34252
2009-06-30	35380
2009-09-30	34806
2009-12-31	33848
2010-03-31	35278
2010-06-30	36591
2010-09-30	40992
2010-12-31	41914
2011-03-31	45329
2011-06-30	48325
2011-09-30	47424
2011-12-31	48153
2012-03-31	50185
2012-06-30	53046
2012-09-30	55251
2012-12-31	57745
2013-03-31	55206
2013-06-30	58129
2013-09-30	61748
2013-12-31	62348
2014-03-31	64787
2014-06-30	70074
2014-09-30	66428
2014-12-31	68699
2015-03-31	79433
2015-06-30	85026
2015-09-30	90779
2015-12-31	91838
2016-03-31	98975
2016-06-30	101622
2016-09-30	101577
2016-12-31	94821
2017-03-31	96037
2017-06-30	102742
2017-09-30	102145
2017-12-31	101705
2018-03-31	103137
2018-06-30	101679
2018-09-30	104952
2018-12-31	102894
2019-03-31	105536
2019-06-30	110918
2019-09-30	108820
2019-12-31	112696
2020-03-31	114403
2020-06-30	114876
2020-09-30	112630
2020-12-31	115426
2021-03-31	113014
2021-06-30	113902
2021-09-30	111291
2021-12-31	104276
2022-03-31	97288
2022-06-30	88329
2022-09-30	83914
2022-12-31	86802
2023-03-31	88705
2023-06-30	91709
2023-09-30	89181
2023-12-31	92911