Quarter	US dollars
2004-12-31	3277
2005-03-31	3316
2005-06-30	3892
2005-09-30	4284
2005-12-31	3924
2006-03-31	7405
2006-06-30	5668
2006-09-30	7497
2006-12-31	8284
2007-03-31	8708
2007-06-30	11804
2007-09-30	15240
2007-12-31	14956
2008-03-31	16600
2008-06-30	16424
2008-09-30	17755
2008-12-31	16752
2009-03-31	17220
2009-06-30	18324
2009-09-30	17370
2009-12-31	17953
2010-03-31	19952
2010-06-30	20341
2010-09-30	20645
2010-12-31	18672
2011-03-31	17729
2011-06-30	19394
2011-09-30	17107
2011-12-31	16659
2012-03-31	17542
2012-06-30	20269
2012-09-30	20874
2012-12-31	18638
2013-03-31	14328
2013-06-30	14342
2013-09-30	17009
2013-12-31	13421
2014-03-31	13909
2014-06-30	13103
2014-09-30	12936
2014-12-31	13303
2015-03-31	11983
2015-06-30	12317
2015-09-30	14758
2015-12-31	13435
2016-03-31	12660
2016-06-30	13379
2016-09-30	12558
2016-12-31	10856
2017-03-31	10044
2017-06-30	13230
2017-09-30	12804
2017-12-31	14152
2018-03-31	15397
2018-06-30	12928
2018-09-30	14174
2018-12-31	14969
2019-03-31	17192
2019-06-30	18682
2019-09-30	20749
2019-12-31	19081
2020-03-31	19968
2020-06-30	18332
2020-09-30	17867
2020-12-31	17774
2021-03-31	18523
2021-06-30	19615
2021-09-30	16673
2021-12-31	18317
2022-03-31	20187
2022-06-30	18910
2022-09-30	17615
2022-12-31	21346
2023-03-31	20284
2023-06-30	19634
2023-09-30	17255