Quarter	US dollars
1999-03-31	2003
1999-06-30	2111
1999-09-30	1917
1999-12-31	2164
2000-03-31	1927
2000-06-30	2350
2000-09-30	2727
2000-12-31	2183
2001-03-31	2222
2001-06-30	2393
2001-09-30	1675
2001-12-31	1455
2002-03-31	1484
2002-06-30	1361
2002-09-30	1444
2002-12-31	2519
2003-03-31	3330
2003-06-30	3632
2003-09-30	3642
2003-12-31	3705
2004-03-31	3528
2004-06-30	3679
2004-09-30	3412
2004-12-31	4064
2005-03-31	3705
2005-06-30	3674
2005-09-30	4456
2005-12-31	4628
2006-03-31	5171
2006-06-30	6363
2006-09-30	5142
2006-12-31	4968
2007-03-31	5429
2007-06-30	5602
2007-09-30	5585
2007-12-31	5192
2008-03-31	5227
2008-06-30	4642
2008-09-30	5207
2008-12-31	5553
2009-03-31	5399
2009-06-30	5983
2009-09-30	7553
2009-12-31	9060
2010-03-31	9991
2010-06-30	10778
2010-09-30	10666
2010-12-31	11772
2011-03-31	13620
2011-06-30	12679
2011-09-30	12302
2011-12-31	12409
2012-03-31	11402
2012-06-30	10736
2012-09-30	10705
2012-12-31	10619
2013-03-31	10309
2013-06-30	10848
2013-09-30	10143
2013-12-31	11375
2014-03-31	11149
2014-06-30	11857
2014-09-30	10625
2014-12-31	10524
2015-03-31	11217
2015-06-30	9000
2015-09-30	8410
2015-12-31	8035
2016-03-31	7095
2016-06-30	8543
2016-09-30	8641
2016-12-31	8513
2017-03-31	9002
2017-06-30	8889
2017-09-30	9064
2017-12-31	10341
2018-03-31	9763
2018-06-30	10234
2018-09-30	10250
2018-12-31	8779
2019-03-31	8068
2019-06-30	7186
2019-09-30	6916
2019-12-31	5460
2020-03-31	5778
2020-06-30	6361
2020-09-30	5722
2020-12-31	5758
2021-03-31	4937
2021-06-30	4299
2021-09-30	3676
2021-12-31	2588
2022-03-31	2488
2022-06-30	1490
2022-09-30	1617
2022-12-31	2195
2023-03-31	2138
2023-06-30	940
2023-09-30	873