Quarter	US dollars
2004-12-31	6053
2005-03-31	6979
2005-06-30	7019
2005-09-30	7004
2005-12-31	7678
2006-03-31	6917
2006-06-30	7281
2006-09-30	8140
2006-12-31	8153
2007-03-31	8122
2007-06-30	9657
2007-09-30	10050
2007-12-31	9779
2008-03-31	9596
2008-06-30	9129
2008-09-30	9937
2008-12-31	8915
2009-03-31	7836
2009-06-30	7641
2009-09-30	7782
2009-12-31	7066
2010-03-31	7122
2010-06-30	9190
2010-09-30	10417
2010-12-31	12513
2011-03-31	13528
2011-06-30	15926
2011-09-30	18801
2011-12-31	19997
2012-03-31	21483
2012-06-30	23046
2012-09-30	22570
2012-12-31	22427
2013-03-31	23793
2013-06-30	25004
2013-09-30	26597
2013-12-31	27513
2014-03-31	28134
2014-06-30	29022
2014-09-30	27839
2014-12-31	24748
2015-03-31	21060
2015-06-30	21250
2015-09-30	16613
2015-12-31	16128
2016-03-31	15318
2016-06-30	15308
2016-09-30	16350
2016-12-31	16399
2017-03-31	17102
2017-06-30	21146
2017-09-30	21337
2017-12-31	20584
2018-03-31	20742
2018-06-30	20510
2018-09-30	19762
2018-12-31	19631
2019-03-31	19700
2019-06-30	20235
2019-09-30	19679
2019-12-31	19627
2020-03-31	21129
2020-06-30	21615
2020-09-30	21319
2020-12-31	22645
2021-03-31	23529
2021-06-30	22720
2021-09-30	24281
2021-12-31	23488
2022-03-31	25667
2022-06-30	24647
2022-09-30	24309
2022-12-31	23151
2023-03-31	22608
2023-06-30	22861
2023-09-30	22481