Quarter	US dollars
2004-12-31	5036
2005-03-31	5085
2005-06-30	5758
2005-09-30	6240
2005-12-31	6168
2006-03-31	7158
2006-06-30	7547
2006-09-30	7495
2006-12-31	8349
2007-03-31	8512
2007-06-30	9629
2007-09-30	10497
2007-12-31	12328
2008-03-31	13155
2008-06-30	14227
2008-09-30	14841
2008-12-31	11696
2009-03-31	11324
2009-06-30	11737
2009-09-30	12897
2009-12-31	12214
2010-03-31	13714
2010-06-30	18273
2010-09-30	20461
2010-12-31	21894
2011-03-31	24329
2011-06-30	26427
2011-09-30	21915
2011-12-31	22616
2012-03-31	25400
2012-06-30	24621
2012-09-30	24866
2012-12-31	23633
2013-03-31	24170
2013-06-30	26013
2013-09-30	26293
2013-12-31	26007
2014-03-31	23689
2014-06-30	25403
2014-09-30	23378
2014-12-31	23456
2015-03-31	19990
2015-06-30	20026
2015-09-30	18320
2015-12-31	15720
2016-03-31	14983
2016-06-30	12227
2016-09-30	13795
2016-12-31	9475
2017-03-31	10975
2017-06-30	11144
2017-09-30	11492
2017-12-31	11660
2018-03-31	10935
2018-06-30	9954
2018-09-30	9433
2018-12-31	8600
2019-03-31	7950
2019-06-30	9102
2019-09-30	8609
2019-12-31	9942
2020-03-31	7066
2020-06-30	7701
2020-09-30	8907
2020-12-31	10164
2021-03-31	7995
2021-06-30	7781
2021-09-30	7018
2021-12-31	8725
2022-03-31	6601
2022-06-30	6367
2022-09-30	5685
2022-12-31	7354
2023-03-31	7180
2023-06-30	6499
2023-09-30	6217