Quarter	US dollars
2004-12-31	7253
2005-03-31	7316
2005-06-30	7034
2005-09-30	7339
2005-12-31	7586
2006-03-31	6846
2006-06-30	6956
2006-09-30	6974
2006-12-31	9585
2007-03-31	9424
2007-06-30	9482
2007-09-30	10379
2007-12-31	9652
2008-03-31	12442
2008-06-30	13375
2008-09-30	13617
2008-12-31	13660
2009-03-31	9711
2009-06-30	9988
2009-09-30	9804
2009-12-31	10369
2010-03-31	8911
2010-06-30	13192
2010-09-30	17646
2010-12-31	18961
2011-03-31	15248
2011-06-30	18453
2011-09-30	23548
2011-12-31	21805
2012-03-31	21210
2012-06-30	21473
2012-09-30	21125
2012-12-31	20257
2013-03-31	22805
2013-06-30	22794
2013-09-30	23723
2013-12-31	25204
2014-03-31	26555
2014-06-30	27624
2014-09-30	29238
2014-12-31	31773
2015-03-31	28226
2015-06-30	29025
2015-09-30	20171
2015-12-31	22183
2016-03-31	24532
2016-06-30	26619
2016-09-30	26127
2016-12-31	27405
2017-03-31	31410
2017-06-30	25857
2017-09-30	27743
2017-12-31	28058
2018-03-31	28839
2018-06-30	29447
2018-09-30	27644
2018-12-31	30503
2019-03-31	33947
2019-06-30	34899
2019-09-30	35236
2019-12-31	35099
2020-03-31	38743
2020-06-30	37343
2020-09-30	36201
2020-12-31	31619
2021-03-31	36275
2021-06-30	35357
2021-09-30	34996
2021-12-31	32343
2022-03-31	33758
2022-06-30	31822
2022-09-30	31609
2022-12-31	27910
2023-03-31	29694
2023-06-30	29932
2023-09-30	31024