Quarter	US dollars
1999-09-30	985
1999-12-31	1011
2000-03-31	1389
2000-06-30	1316
2000-09-30	1413
2000-12-31	1348
2001-03-31	1550
2001-06-30	1436
2001-09-30	1486
2001-12-31	1728
2002-03-31	1678
2002-06-30	1680
2002-09-30	1568
2002-12-31	1582
2003-03-31	1443
2003-06-30	1442
2003-09-30	1663
2003-12-31	1638
2004-03-31	1748
2004-06-30	1690
2004-09-30	1666
2004-12-31	1837
2005-03-31	1919
2005-06-30	1855
2005-09-30	2001
2005-12-31	1929
2006-03-31	2042
2006-06-30	2807
2006-09-30	2281
2006-12-31	2362
2007-03-31	2214
2007-06-30	2452
2007-09-30	2357
2007-12-31	2437
2008-03-31	3116
2008-06-30	2900
2008-09-30	3883
2008-12-31	3272
2009-03-31	4586
2009-06-30	4489
2009-09-30	4508
2009-12-31	5495
2010-03-31	5360
2010-06-30	6058
2010-09-30	6888
2010-12-31	5982
2011-03-31	6497
2011-06-30	8039
2011-09-30	7272
2011-12-31	7970
2012-03-31	8024
2012-06-30	8699
2012-09-30	8333
2012-12-31	8538
2013-03-31	7489
2013-06-30	7162
2013-09-30	10860
2013-12-31	5834
2014-03-31	5457
2014-06-30	5608
2014-09-30	5454
2014-12-31	5196
2015-03-31	4536
2015-06-30	4451
2015-09-30	3693
2015-12-31	3481
2016-03-31	3629
2016-06-30	3705
2016-09-30	3605
2016-12-31	3787
2017-03-31	3422
2017-06-30	3185
2017-09-30	3188
2017-12-31	3609
2018-03-31	2791
2018-06-30	3178
2018-09-30	3136
2018-12-31	3333
2019-03-31	3372
2019-06-30	3760
2019-09-30	3866
2019-12-31	4229
2020-03-31	3900
2020-06-30	3343
2020-09-30	3130
2020-12-31	2638
2021-03-31	2163
2021-06-30	2060
2021-09-30	2168
2021-12-31	1775
2022-03-31	2697
2022-06-30	2838
2022-09-30	3100
2022-12-31	3807
2023-03-31	3446
2023-06-30	3519
2023-09-30	3037