Quarter	US dollars
2004-12-31	9759
2005-03-31	10753
2005-06-30	8776
2005-09-30	8487
2005-12-31	10662
2006-03-31	17241
2006-06-30	15676
2006-09-30	13145
2006-12-31	13265
2007-03-31	18660
2007-06-30	17731
2007-09-30	17699
2007-12-31	17070
2008-03-31	20620
2008-06-30	16520
2008-09-30	17121
2008-12-31	15144
2009-03-31	9327
2009-06-30	9291
2009-09-30	9434
2009-12-31	9673
2010-03-31	10685
2010-06-30	12947
2010-09-30	10576
2010-12-31	8651
2011-03-31	8512
2011-06-30	8839
2011-09-30	9645
2011-12-31	8538
2012-03-31	10360
2012-06-30	10031
2012-09-30	10151
2012-12-31	10600
2013-03-31	16268
2013-06-30	13233
2013-09-30	11692
2013-12-31	9905
2014-03-31	10732
2014-06-30	10446
2014-09-30	9157
2014-12-31	10087
2015-03-31	7752
2015-06-30	6509
2015-09-30	8214
2015-12-31	6571
2016-03-31	6237
2016-06-30	4939
2016-09-30	4605
2016-12-31	4251
2017-03-31	3641
2017-06-30	3483
2017-09-30	4337
2017-12-31	4568
2018-03-31	4270
2018-06-30	4274
2018-09-30	5888
2018-12-31	4439
2019-03-31	4300
2019-06-30	3312
2019-09-30	2671
2019-12-31	3328
2020-03-31	3226
2020-06-30	4289
2020-09-30	4187
2020-12-31	3500
2021-03-31	2882
2021-06-30	3364
2021-09-30	4838
2021-12-31	3062
2022-03-31	3292
2022-06-30	3286
2022-09-30	2743
2022-12-31	2446
2023-03-31	2477
2023-06-30	2831
2023-09-30	3572