Quarter	US dollars
2004-12-31	13627
2005-03-31	12715
2005-06-30	12413
2005-09-30	12350
2005-12-31	11414
2006-03-31	12306
2006-06-30	13834
2006-09-30	14355
2006-12-31	13842
2007-03-31	12291
2007-06-30	11792
2007-09-30	11792
2007-12-31	8664
2008-03-31	10579
2008-06-30	10159
2008-09-30	9616
2008-12-31	9635
2009-03-31	6627
2009-06-30	6393
2009-09-30	7406
2009-12-31	6774
2010-03-31	5835
2010-06-30	5213
2010-09-30	5916
2010-12-31	6818
2011-03-31	8090
2011-06-30	7156
2011-09-30	6414
2011-12-31	7211
2012-03-31	8759
2012-06-30	10208
2012-09-30	12801
2012-12-31	14441
2013-03-31	16257
2013-06-30	11838
2013-09-30	11893
2013-12-31	14057
2014-03-31	13600
2014-06-30	11523
2014-09-30	11726
2014-12-31	13218
2015-03-31	11523
2015-06-30	13687
2015-09-30	16500
2015-12-31	16788
2016-03-31	17921
2016-06-30	15289
2016-09-30	16302
2016-12-31	16928
2017-03-31	15439
2017-06-30	14716
2017-09-30	15088
2017-12-31	15666
2018-03-31	17265
2018-06-30	19205
2018-09-30	20232
2018-12-31	21749
2019-03-31	20263
2019-06-30	23504
2019-09-30	23716
2019-12-31	23839
2020-03-31	26335
2020-06-30	31424
2020-09-30	31846
2020-12-31	34161
2021-03-31	30590
2021-06-30	32678
2021-09-30	32394
2021-12-31	33643
2022-03-31	35643
2022-06-30	34019
2022-09-30	32671
2022-12-31	36001
2023-03-31	37449
2023-06-30	38336
2023-09-30	39451