Quarter	US dollars
1999-03-31	31032
1999-06-30	30572
1999-09-30	32295
1999-12-31	30518
2000-03-31	32945
2000-06-30	33303
2000-09-30	33259
2000-12-31	34882
2001-03-31	35738
2001-06-30	36507
2001-09-30	36161
2001-12-31	34722
2002-03-31	34673
2002-06-30	35031
2002-09-30	34486
2002-12-31	32478
2003-03-31	32542
2003-06-30	32275
2003-09-30	32582
2003-12-31	35076
2004-03-31	35873
2004-06-30	35355
2004-09-30	38195
2004-12-31	38649
2005-03-31	38901
2005-06-30	40571
2005-09-30	46593
2005-12-31	42375
2006-03-31	48395
2006-06-30	51271
2006-09-30	57544
2006-12-31	57105
2007-03-31	62442
2007-06-30	64649
2007-09-30	70167
2007-12-31	75831
2008-03-31	72574
2008-06-30	75958
2008-09-30	64304
2008-12-31	52876
2009-03-31	50425
2009-06-30	54828
2009-09-30	51796
2009-12-31	51877
2010-03-31	52945
2010-06-30	59306
2010-09-30	58953
2010-12-31	57608
2011-03-31	67418
2011-06-30	67911
2011-09-30	72045
2011-12-31	69255
2012-03-31	91753
2012-06-30	90133
2012-09-30	83989
2012-12-31	73895
2013-03-31	73309
2013-06-30	74030
2013-09-30	75687
2013-12-31	62472
2014-03-31	76678
2014-06-30	77599
2014-09-30	74662
2014-12-31	71351
2015-03-31	70574
2015-06-30	69012
2015-09-30	68028
2015-12-31	65459
2016-03-31	66428
2016-06-30	71167
2016-09-30	73557
2016-12-31	68158
2017-03-31	73999
2017-06-30	77280
2017-09-30	86531
2017-12-31	86643
2018-03-31	97637
2018-06-30	86012
2018-09-30	89607
2018-12-31	93922
2019-03-31	96321
2019-06-30	101367
2019-09-30	117742
2019-12-31	114681
2020-03-31	132696
2020-06-30	109319
2020-09-30	111209
2020-12-31	113399
2021-03-31	107896
2021-06-30	111487
2021-09-30	128221
2021-12-31	126304
2022-03-31	136231
2022-06-30	129506
2022-09-30	147110
2022-12-31	147290
2023-03-31	156332
2023-06-30	150235
2023-09-30	150603