Quarter	US dollars
1999-03-31	2211
1999-06-30	1982
1999-09-30	2088
1999-12-31	1525
2000-03-31	2917
2000-06-30	2807
2000-09-30	2982
2000-12-31	2994
2001-03-31	3078
2001-06-30	2770
2001-09-30	2414
2001-12-31	2188
2002-03-31	4790
2002-06-30	3548
2002-09-30	3374
2002-12-31	2018
2003-03-31	2057
2003-06-30	2465
2003-09-30	8118
2003-12-31	9984
2004-03-31	2656
2004-06-30	3571
2004-09-30	3137
2004-12-31	2863
2005-03-31	4156
2005-06-30	7205
2005-09-30	6968
2005-12-31	7270
2006-03-31	8519
2006-06-30	7643
2006-09-30	7822
2006-12-31	7908
2007-03-31	9116
2007-06-30	8608
2007-09-30	5987
2007-12-31	5741
2008-03-31	5798
2008-06-30	3766
2008-09-30	4606
2008-12-31	3387
2009-03-31	3565
2009-06-30	4825
2009-09-30	5268
2009-12-31	4479
2010-03-31	7546
2010-06-30	3155
2010-09-30	5122
2010-12-31	4515
2011-03-31	3694
2011-06-30	6106
2011-09-30	6023
2011-12-31	4987
2012-03-31	5352
2012-06-30	3312
2012-09-30	7192
2012-12-31	3450
2013-03-31	4568
2013-06-30	6015
2013-09-30	6119
2013-12-31	5525
2014-03-31	5417
2014-06-30	4222
2014-09-30	4928
2014-12-31	6527
2015-03-31	5846
2015-06-30	5857
2015-09-30	8256
2015-12-31	9162
2016-03-31	8096
2016-06-30	7495
2016-09-30	3296
2016-12-31	3162
2017-03-31	4442
2017-06-30	3232
2017-09-30	3845
2017-12-31	3594
2018-03-31	4475
2018-06-30	3998
2018-09-30	4147
2018-12-31	4328
2019-03-31	4819
2019-06-30	4958
2019-09-30	4473
2019-12-31	6139
2020-03-31	5905
2020-06-30	4419
2020-09-30	4271
2020-12-31	4462
2021-03-31	5028
2021-06-30	4103
2021-09-30	4012
2021-12-31	3424
2022-03-31	3067
2022-06-30	3384
2022-09-30	3879
2022-12-31	3507
2023-03-31	3434
2023-06-30	2580
2023-09-30	2687