Quarter	US dollars
1999-03-31	2640
1999-06-30	3355
1999-09-30	2503
1999-12-31	3196
2000-03-31	3017
2000-06-30	3418
2000-09-30	2835
2000-12-31	3016
2001-03-31	3367
2001-06-30	2938
2001-09-30	3752
2001-12-31	4622
2002-03-31	4985
2002-06-30	3781
2002-09-30	2721
2002-12-31	5005
2003-03-31	5112
2003-06-30	7597
2003-09-30	5096
2003-12-31	5557
2004-03-31	4725
2004-06-30	4740
2004-09-30	6951
2004-12-31	5827
2005-03-31	8731
2005-06-30	8579
2005-09-30	7558
2005-12-31	7308
2006-03-31	8514
2006-06-30	8347
2006-09-30	9407
2006-12-31	10805
2007-03-31	10263
2007-06-30	10100
2007-09-30	9345
2007-12-31	8665
2008-03-31	10414
2008-06-30	8967
2008-09-30	6850
2008-12-31	4206
2009-03-31	4275
2009-06-30	5413
2009-09-30	3699
2009-12-31	4214
2010-03-31	4990
2010-06-30	4541
2010-09-30	2954
2010-12-31	3423
2011-03-31	4021
2011-06-30	3272
2011-09-30	3604
2011-12-31	4732
2012-03-31	4859
2012-06-30	6458
2012-09-30	3683
2012-12-31	4018
2013-03-31	2987
2013-06-30	3317
2013-09-30	5283
2013-12-31	3113
2014-03-31	2750
2014-06-30	2250
2014-09-30	2899
2014-12-31	3767
2015-03-31	2976
2015-06-30	2477
2015-09-30	2110
2015-12-31	1760
2016-03-31	2603
2016-06-30	2177
2016-09-30	2473
2016-12-31	3251
2017-03-31	3037
2017-06-30	3933
2017-09-30	3311
2017-12-31	4725
2018-03-31	2825
2018-06-30	2318
2018-09-30	1693
2018-12-31	3055
2019-03-31	3739
2019-06-30	5272
2019-09-30	3057
2019-12-31	4190
2020-03-31	5835
2020-06-30	4199
2020-09-30	4014
2020-12-31	4340
2021-03-31	5706
2021-06-30	4602
2021-09-30	4785
2021-12-31	4991
2022-03-31	4734
2022-06-30	5762
2022-09-30	5141
2022-12-31	7494
2023-03-31	9267
2023-06-30	5028
2023-09-30	5732