Quarter	US dollars
1999-03-31	6427
1999-06-30	7406
1999-09-30	7671
1999-12-31	6969
2000-03-31	8644
2000-06-30	8972
2000-09-30	9670
2000-12-31	12187
2001-03-31	11763
2001-06-30	12124
2001-09-30	10699
2001-12-31	10321
2002-03-31	11706
2002-06-30	12952
2002-09-30	12777
2002-12-31	13438
2003-03-31	15872
2003-06-30	17784
2003-09-30	15383
2003-12-31	16018
2004-03-31	17136
2004-06-30	17559
2004-09-30	17363
2004-12-31	18299
2005-03-31	18448
2005-06-30	18480
2005-09-30	17223
2005-12-31	21768
2006-03-31	20487
2006-06-30	20444
2006-09-30	31770
2006-12-31	28880
2007-03-31	31373
2007-06-30	33352
2007-09-30	34005
2007-12-31	38118
2008-03-31	44409
2008-06-30	41183
2008-09-30	42401
2008-12-31	39210
2009-03-31	32613
2009-06-30	35982
2009-09-30	34682
2009-12-31	32475
2010-03-31	33944
2010-06-30	31333
2010-09-30	36441
2010-12-31	38480
2011-03-31	41149
2011-06-30	42308
2011-09-30	35967
2011-12-31	36957
2012-03-31	38072
2012-06-30	38294
2012-09-30	38616
2012-12-31	38464
2013-03-31	35775
2013-06-30	29790
2013-09-30	32295
2013-12-31	32740
2014-03-31	34860
2014-06-30	34474
2014-09-30	31155
2014-12-31	31785
2015-03-31	34528
2015-06-30	31244
2015-09-30	30747
2015-12-31	30613
2016-03-31	30906
2016-06-30	28206
2016-09-30	29674
2016-12-31	29360
2017-03-31	31068
2017-06-30	30065
2017-09-30	29352
2017-12-31	31158
2018-03-31	34825
2018-06-30	28396
2018-09-30	33540
2018-12-31	31635
2019-03-31	31493
2019-06-30	31383
2019-09-30	33614
2019-12-31	32994
2020-03-31	40295
2020-06-30	38289
2020-09-30	40232
2020-12-31	41271
2021-03-31	38451
2021-06-30	39902
2021-09-30	43180
2021-12-31	45366
2022-03-31	46824
2022-06-30	39541
2022-09-30	46525
2022-12-31	39754
2023-03-31	35133
2023-06-30	35212
2023-09-30	39389