Quarter	US dollars
1999-09-30	980
1999-12-31	842
2000-03-31	809
2000-06-30	1226
2000-09-30	1348
2000-12-31	1830
2001-03-31	2054
2001-06-30	1975
2001-09-30	2462
2001-12-31	2552
2002-03-31	2025
2002-06-30	2958
2002-09-30	4086
2002-12-31	5163
2003-03-31	5785
2003-06-30	6908
2003-09-30	6481
2003-12-31	6333
2004-03-31	7243
2004-06-30	5811
2004-09-30	6773
2004-12-31	9507
2005-03-31	8711
2005-06-30	12329
2005-09-30	10807
2005-12-31	9139
2006-03-31	7037
2006-06-30	7472
2006-09-30	5846
2006-12-31	4435
2007-03-31	8502
2007-06-30	11402
2007-09-30	11314
2007-12-31	12658
2008-03-31	17504
2008-06-30	21437
2008-09-30	18161
2008-12-31	43093
2009-03-31	33727
2009-06-30	27172
2009-09-30	26806
2009-12-31	23644
2010-03-31	24813
2010-06-30	26216
2010-09-30	28443
2010-12-31	21047
2011-03-31	17191
2011-06-30	17944
2011-09-30	24652
2011-12-31	25415
2012-03-31	25969
2012-06-30	24398
2012-09-30	16319
2012-12-31	13719
2013-03-31	14027
2013-06-30	10500
2013-09-30	10387
2013-12-31	9685
2014-03-31	11930
2014-06-30	13551
2014-09-30	14273
2014-12-31	15948
2015-03-31	16559
2015-06-30	13024
2015-09-30	13085
2015-12-31	10822
2016-03-31	12759
2016-06-30	12653
2016-09-30	12696
2016-12-31	9860
2017-03-31	8436
2017-06-30	5953
2017-09-30	5836
2017-12-31	5659
2018-03-31	5699
2018-06-30	2367
2018-09-30	3293
2018-12-31	5698
2019-03-31	4073
2019-06-30	4487
2019-09-30	4987
2019-12-31	4675
2020-03-31	5302
2020-06-30	5785
2020-09-30	5433
2020-12-31	6049
2021-03-31	4482
2021-06-30	4394
2021-09-30	4060
2021-12-31	4205
2022-03-31	3113
2022-06-30	3382
2022-09-30	3403
2022-12-31	2012
2023-03-31	1838
2023-06-30	1817
2023-09-30	1590