Quarter	US dollars
2004-12-31	4859
2005-03-31	6172
2005-06-30	5806
2005-09-30	5704
2005-12-31	5291
2006-03-31	5608
2006-06-30	6848
2006-09-30	6423
2006-12-31	7129
2007-03-31	6996
2007-06-30	9480
2007-09-30	5831
2007-12-31	9524
2008-03-31	11180
2008-06-30	14259
2008-09-30	11113
2008-12-31	9744
2009-03-31	9239
2009-06-30	10656
2009-09-30	10443
2009-12-31	10871
2010-03-31	12287
2010-06-30	11121
2010-09-30	11911
2010-12-31	12784
2011-03-31	14632
2011-06-30	17973
2011-09-30	14792
2011-12-31	16526
2012-03-31	16508
2012-06-30	17261
2012-09-30	17399
2012-12-31	19138
2013-03-31	18542
2013-06-30	19948
2013-09-30	20367
2013-12-31	19749
2014-03-31	20931
2014-06-30	21700
2014-09-30	20894
2014-12-31	16878
2015-03-31	15246
2015-06-30	11389
2015-09-30	8866
2015-12-31	9662
2016-03-31	11794
2016-06-30	11311
2016-09-30	11530
2016-12-31	10283
2017-03-31	10007
2017-06-30	9576
2017-09-30	8975
2017-12-31	9137
2018-03-31	9958
2018-06-30	10865
2018-09-30	9627
2018-12-31	10478
2019-03-31	12230
2019-06-30	11112
2019-09-30	10779
2019-12-31	10627
2020-03-31	10037
2020-06-30	9817
2020-09-30	10759
2020-12-31	9734
2021-03-31	11008
2021-06-30	11918
2021-09-30	11608
2021-12-31	11672
2022-03-31	11801
2022-06-30	11683
2022-09-30	11107
2022-12-31	11475
2023-03-31	12791
2023-06-30	11334
2023-09-30	10678