Quarter	US dollars
2004-12-31	4590
2005-03-31	6019
2005-06-30	2771
2005-09-30	7211
2005-12-31	2439
2006-03-31	4133
2006-06-30	3164
2006-09-30	8080
2006-12-31	2714
2007-03-31	4123
2007-06-30	9085
2007-09-30	4435
2007-12-31	5744
2008-03-31	6797
2008-06-30	6454
2008-09-30	5681
2008-12-31	2865
2009-03-31	3027
2009-06-30	3710
2009-09-30	6108
2009-12-31	8240
2010-03-31	10206
2010-06-30	11970
2010-09-30	11602
2010-12-31	11890
2011-03-31	13892
2011-06-30	13453
2011-09-30	13523
2011-12-31	9573
2012-03-31	6153
2012-06-30	6787
2012-09-30	9255
2012-12-31	10852
2013-03-31	13145
2013-06-30	15008
2013-09-30	16299
2013-12-31	18437
2014-03-31	17593
2014-06-30	16856
2014-09-30	18454
2014-12-31	13520
2015-03-31	12100
2015-06-30	11045
2015-09-30	8847
2015-12-31	7927
2016-03-31	11108
2016-06-30	10872
2016-09-30	10954
2016-12-31	10624
2017-03-31	12039
2017-06-30	13508
2017-09-30	13946
2017-12-31	14144
2018-03-31	16323
2018-06-30	16539
2018-09-30	15184
2018-12-31	15751
2019-03-31	15817
2019-06-30	14353
2019-09-30	14030
2019-12-31	11832
2020-03-31	17063
2020-06-30	14566
2020-09-30	14515
2020-12-31	13676
2021-03-31	17824
2021-06-30	17431
2021-09-30	17323
2021-12-31	18275
2022-03-31	18810
2022-06-30	20365
2022-09-30	20567
2022-12-31	16451
2023-03-31	17760
2023-06-30	19783
2023-09-30	22770