Quarter	US dollars
2004-12-31	3072
2005-03-31	3206
2005-06-30	3476
2005-09-30	3518
2005-12-31	3656
2006-03-31	3819
2006-06-30	4065
2006-09-30	4032
2006-12-31	4161
2007-03-31	4052
2007-06-30	4290
2007-09-30	4515
2007-12-31	4625
2008-03-31	6084
2008-06-30	6707
2008-09-30	6603
2008-12-31	6045
2009-03-31	5704
2009-06-30	6597
2009-09-30	6221
2009-12-31	5703
2010-03-31	6525
2010-06-30	7776
2010-09-30	9434
2010-12-31	9792
2011-03-31	10567
2011-06-30	11504
2011-09-30	11170
2011-12-31	11056
2012-03-31	12492
2012-06-30	13193
2012-09-30	13149
2012-12-31	14556
2013-03-31	14378
2013-06-30	14500
2013-09-30	14792
2013-12-31	15062
2014-03-31	14959
2014-06-30	15714
2014-09-30	15275
2014-12-31	15168
2015-03-31	14813
2015-06-30	14570
2015-09-30	13526
2015-12-31	12898
2016-03-31	12587
2016-06-30	12615
2016-09-30	12182
2016-12-31	11471
2017-03-31	11694
2017-06-30	12712
2017-09-30	12653
2017-12-31	11898
2018-03-31	11100
2018-06-30	11110
2018-09-30	10731
2018-12-31	11272
2019-03-31	10819
2019-06-30	11486
2019-09-30	11026
2019-12-31	11083
2020-03-31	10107
2020-06-30	9772
2020-09-30	9243
2020-12-31	9199
2021-03-31	8668
2021-06-30	9293
2021-09-30	9187
2021-12-31	9166
2022-03-31	9005
2022-06-30	9288
2022-09-30	9589
2022-12-31	8588
2023-03-31	8270
2023-06-30	8610
2023-09-30	8722