Quarter	US dollars
2004-12-31	2674
2005-03-31	3229
2005-06-30	3365
2005-09-30	3111
2005-12-31	3725
2006-03-31	4007
2006-06-30	4061
2006-09-30	4132
2006-12-31	4274
2007-03-31	4719
2007-06-30	4847
2007-09-30	5876
2007-12-31	6542
2008-03-31	6390
2008-06-30	6587
2008-09-30	6929
2008-12-31	7350
2009-03-31	6939
2009-06-30	5762
2009-09-30	6991
2009-12-31	6551
2010-03-31	6570
2010-06-30	7161
2010-09-30	7726
2010-12-31	8945
2011-03-31	9823
2011-06-30	9770
2011-09-30	11189
2011-12-31	12729
2012-03-31	13320
2012-06-30	14458
2012-09-30	14927
2012-12-31	15120
2013-03-31	15116
2013-06-30	16267
2013-09-30	17153
2013-12-31	18075
2014-03-31	19502
2014-06-30	21274
2014-09-30	21585
2014-12-31	23484
2015-03-31	23956
2015-06-30	25453
2015-09-30	19838
2015-12-31	17835
2016-03-31	18338
2016-06-30	17130
2016-09-30	17086
2016-12-31	17298
2017-03-31	17852
2017-06-30	16868
2017-09-30	17371
2017-12-31	17898
2018-03-31	17762
2018-06-30	16876
2018-09-30	15757
2018-12-31	15555
2019-03-31	15560
2019-06-30	15389
2019-09-30	13299