Quarter	US dollars
2004-12-31	5255
2005-03-31	5242
2005-06-30	4218
2005-09-30	4399
2005-12-31	4056
2006-03-31	5327
2006-06-30	4551
2006-09-30	3451
2006-12-31	3928
2007-03-31	6535
2007-06-30	6087
2007-09-30	6220
2007-12-31	5614
2008-03-31	5855
2008-06-30	5998
2008-09-30	6059
2008-12-31	4872
2009-03-31	4706
2009-06-30	4693
2009-09-30	3953
2009-12-31	4137
2010-03-31	4682
2010-06-30	4571
2010-09-30	4753
2010-12-31	5756
2011-03-31	5604
2011-06-30	2816
2011-09-30	4032
2011-12-31	2692
2012-03-31	3006
2012-06-30	2685
2012-09-30	2552
2012-12-31	2002
2013-03-31	2103
2013-06-30	1559
2013-09-30	1511
2013-12-31	1354
2014-03-31	3085
2014-06-30	2924
2014-09-30	2759
2014-12-31	2944
2015-03-31	2880
2015-06-30	2729
2015-09-30	3111
2015-12-31	2764
2016-03-31	2784
2016-06-30	3528
2016-09-30	2766
2016-12-31	2865
2017-03-31	3437
2017-06-30	5409
2017-09-30	3826
2017-12-31	2779
2018-03-31	3432
2018-06-30	4840
2018-09-30	4617
2018-12-31	2614
2019-03-31	4460
2019-06-30	3734
2019-09-30	3533
2019-12-31	3252
2020-03-31	3201
2020-06-30	4307
2020-09-30	4978
2020-12-31	4338
2021-03-31	4896
2021-06-30	7824
2021-09-30	4550
2021-12-31	3745
2022-03-31	3900
2022-06-30	9181
2022-09-30	4229
2022-12-31	4151
2023-03-31	4176
2023-06-30	4326
2023-09-30	3890