Quarter	US dollars
2004-12-31	8522
2005-03-31	9231
2005-06-30	9900
2005-09-30	10452
2005-12-31	10288
2006-03-31	10731
2006-06-30	10366
2006-09-30	11127
2006-12-31	13605
2007-03-31	14418
2007-06-30	16035
2007-09-30	17100
2007-12-31	16873
2008-03-31	17472
2008-06-30	18854
2008-09-30	20393
2008-12-31	16889
2009-03-31	15341
2009-06-30	15501
2009-09-30	15592
2009-12-31	15481
2010-03-31	16041
2010-06-30	16392
2010-09-30	16768
2010-12-31	14561
2011-03-31	15209
2011-06-30	15995
2011-09-30	15461
2011-12-31	15548
2012-03-31	16424
2012-06-30	16630
2012-09-30	17352
2012-12-31	16781
2013-03-31	17141
2013-06-30	16846
2013-09-30	16847
2013-12-31	17806
2014-03-31	18124
2014-06-30	19190
2014-09-30	18897
2014-12-31	18664
2015-03-31	17620
2015-06-30	16578
2015-09-30	14924
2015-12-31	14606
2016-03-31	13659
2016-06-30	12207
2016-09-30	13235
2016-12-31	14558
2017-03-31	16556
2017-06-30	11675
2017-09-30	12969
2017-12-31	15178
2018-03-31	11479
2018-06-30	10915
2018-09-30	10724
2018-12-31	11023
2019-03-31	11582
2019-06-30	11299
2019-09-30	10858
2019-12-31	12057
2020-03-31	11913
2020-06-30	11231
2020-09-30	9117
2020-12-31	6306
2021-03-31	6822
2021-06-30	5523
2021-09-30	5648
2021-12-31	5949
2022-03-31	4946
2022-06-30	4809
2022-09-30	3897
2022-12-31	3986
2023-03-31	4502
2023-06-30	4592
2023-09-30	4294