Quarter	US dollars
1999-09-30	1088
1999-12-31	1051
2000-03-31	1298
2000-06-30	1544
2000-09-30	2318
2000-12-31	1936
2001-03-31	2723
2001-06-30	2013
2001-09-30	2409
2001-12-31	2086
2002-03-31	2334
2002-06-30	2940
2002-09-30	2802
2002-12-31	3180
2003-03-31	2943
2003-06-30	4546
2003-09-30	4539
2003-12-31	5364
2004-03-31	5139
2004-06-30	4280
2004-09-30	3825
2004-12-31	5076
2005-03-31	4287
2005-06-30	5017
2005-09-30	4721
2005-12-31	4559
2006-03-31	4723
2006-06-30	6308
2006-09-30	4596
2006-12-31	6642
2007-03-31	5452
2007-06-30	9089
2007-09-30	10941
2007-12-31	10066
2008-03-31	12545
2008-06-30	14663
2008-09-30	15146
2008-12-31	21078
2009-03-31	18294
2009-06-30	19995
2009-09-30	22648
2009-12-31	17277
2010-03-31	17773
2010-06-30	20624
2010-09-30	25917
2010-12-31	25349
2011-03-31	25736
2011-06-30	26568
2011-09-30	26232
2011-12-31	26146
2012-03-31	22899
2012-06-30	24374
2012-09-30	23831
2012-12-31	15979
2013-03-31	15217
2013-06-30	14457
2013-09-30	11797
2013-12-31	11793
2014-03-31	10802
2014-06-30	9937
2014-09-30	13398
2014-12-31	13904
2015-03-31	14759
2015-06-30	10982
2015-09-30	12773
2015-12-31	10819
2016-03-31	11823
2016-06-30	10771
2016-09-30	8834
2016-12-31	8926
2017-03-31	6736
2017-06-30	6627
2017-09-30	7034
2017-12-31	6389
2018-03-31	6457
2018-06-30	5990
2018-09-30	6463
2018-12-31	6427
2019-03-31	5173
2019-06-30	5773
2019-09-30	7351
2019-12-31	6437
2020-03-31	10606
2020-06-30	7686
2020-09-30	5811
2020-12-31	7395
2021-03-31	6026
2021-06-30	5265
2021-09-30	4524
2021-12-31	3946
2022-03-31	4443
2022-06-30	6240
2022-09-30	7886
2022-12-31	5594
2023-03-31	5129
2023-06-30	4840
2023-09-30	5278