Quarter	US dollars
1999-09-30	1541
1999-12-31	1311
2000-03-31	1157
2000-06-30	1564
2000-09-30	1900
2000-12-31	1736
2001-03-31	2315
2001-06-30	2041
2001-09-30	2758
2001-12-31	2946
2002-03-31	2516
2002-06-30	3438
2002-09-30	3872
2002-12-31	4172
2003-03-31	4064
2003-06-30	4873
2003-09-30	4401
2003-12-31	4501
2004-03-31	4264
2004-06-30	3413
2004-09-30	3736
2004-12-31	4375
2005-03-31	3543
2005-06-30	4073
2005-09-30	4571
2005-12-31	4916
2006-03-31	5014
2006-06-30	5987
2006-09-30	4637
2006-12-31	4769
2007-03-31	5170
2007-06-30	7143
2007-09-30	9079
2007-12-31	10645
2008-03-31	17665
2008-06-30	17694
2008-09-30	16449
2008-12-31	33582
2009-03-31	30161
2009-06-30	16213
2009-09-30	13676
2009-12-31	10404
2010-03-31	9623
2010-06-30	14473
2010-09-30	13845
2010-12-31	12967
2011-03-31	11109
2011-06-30	10878
2011-09-30	19056
2011-12-31	16183
2012-03-31	14456
2012-06-30	13940
2012-09-30	12377
2012-12-31	10575
2013-03-31	10958
2013-06-30	9793
2013-09-30	8536
2013-12-31	8127
2014-03-31	7383
2014-06-30	7304
2014-09-30	9111
2014-12-31	10151
2015-03-31	12578
2015-06-30	9581
2015-09-30	10600
2015-12-31	11334
2016-03-31	10663
2016-06-30	10385
2016-09-30	9282
2016-12-31	7880
2017-03-31	7059
2017-06-30	7264
2017-09-30	7238
2017-12-31	6935
2018-03-31	6885
2018-06-30	6326
2018-09-30	6548
2018-12-31	8218
2019-03-31	6661
2019-06-30	6517
2019-09-30	7757
2019-12-31	6987
2020-03-31	15070
2020-06-30	8603
2020-09-30	7436
2020-12-31	9669
2021-03-31	7159
2021-06-30	6118
2021-09-30	5496
2021-12-31	5288
2022-03-31	5760
2022-06-30	7034
2022-09-30	11353
2022-12-31	6889
2023-03-31	4808
2023-06-30	4925
2023-09-30	5899