Quarter	US dollars
2004-12-31	15090
2005-03-31	13609
2005-06-30	13659
2005-09-30	13668
2005-12-31	12957
2006-03-31	14140
2006-06-30	16757
2006-09-30	18142
2006-12-31	18098
2007-03-31	17554
2007-06-30	16350
2007-09-30	16641
2007-12-31	18044
2008-03-31	19951
2008-06-30	18307
2008-09-30	16520
2008-12-31	14084
2009-03-31	12742
2009-06-30	13948
2009-09-30	15720
2009-12-31	17390
2010-03-31	15640
2010-06-30	13072
2010-09-30	9511
2010-12-31	13701
2011-03-31	12680
2011-06-30	13477
2011-09-30	10416
2011-12-31	13377
2012-03-31	15845
2012-06-30	15923
2012-09-30	16617
2012-12-31	18244
2013-03-31	18371
2013-06-30	14798
2013-09-30	12860
2013-12-31	10644
2014-03-31	9042
2014-06-30	11005
2014-09-30	10038
2014-12-31	11228
2015-03-31	12281
2015-06-30	10535
2015-09-30	11689
2015-12-31	11708
2016-03-31	12769
2016-06-30	12822
2016-09-30	10464
2016-12-31	10871
2017-03-31	11081
2017-06-30	10795
2017-09-30	10786
2017-12-31	11859
2018-03-31	11583
2018-06-30	12622
2018-09-30	11820
2018-12-31	12909
2019-03-31	13661
2019-06-30	13507
2019-09-30	14770
2019-12-31	15593
2020-03-31	16315
2020-06-30	16723
2020-09-30	17587
2020-12-31	19521
2021-03-31	19135
2021-06-30	16258
2021-09-30	14847
2021-12-31	18391
2022-03-31	20617
2022-06-30	21049
2022-09-30	20897
2022-12-31	22398
2023-03-31	22060
2023-06-30	24848
2023-09-30	26829