Quarter	US dollars
2004-12-31	4016
2005-03-31	4437
2005-06-30	4098
2005-09-30	4222
2005-12-31	4101
2006-03-31	5287
2006-06-30	5650
2006-09-30	6701
2006-12-31	5456
2007-03-31	8383
2007-06-30	7237
2007-09-30	8007
2007-12-31	5252
2008-03-31	8624
2008-06-30	9306
2008-09-30	9385
2008-12-31	3897
2009-03-31	7484
2009-06-30	8878
2009-09-30	9669
2009-12-31	9694
2010-03-31	11650
2010-06-30	9891
2010-09-30	6560
2010-12-31	9110
2011-03-31	9903
2011-06-30	14850
2011-09-30	14283
2011-12-31	9946
2012-03-31	16181
2012-06-30	13029
2012-09-30	13124
2012-12-31	12854
2013-03-31	12644
2013-06-30	11398
2013-09-30	12076
2013-12-31	12927
2014-03-31	9635
2014-06-30	11096
2014-09-30	9808
2014-12-31	14281
2015-03-31	13674
2015-06-30	16742
2015-09-30	10536
2015-12-31	11974
2016-03-31	9771
2016-06-30	8639
2016-09-30	10329
2016-12-31	11636
2017-03-31	13928
2017-06-30	12746
2017-09-30	10385
2017-12-31	15208
2018-03-31	19039
2018-06-30	18653
2018-09-30	17352
2018-12-31	15482
2019-03-31	15553
2019-06-30	11901
2019-09-30	13460
2019-12-31	14174
2020-03-31	15037
2020-06-30	12264
2020-09-30	12704
2020-12-31	15852
2021-03-31	16801
2021-06-30	20579
2021-09-30	15430
2021-12-31	20676
2022-03-31	18736
2022-06-30	15684
2022-09-30	19360
2022-12-31	18276
2023-03-31	13684
2023-06-30	14093
2023-09-30	15992