Quarter	US dollars
2004-12-31	2744
2005-03-31	2819
2005-06-30	2800
2005-09-30	3249
2005-12-31	2973
2006-03-31	3743
2006-06-30	4181
2006-09-30	3792
2006-12-31	4002
2007-03-31	4097
2007-06-30	4699
2007-09-30	4949
2007-12-31	5113
2008-03-31	6215
2008-06-30	6812
2008-09-30	7515
2008-12-31	7026
2009-03-31	6383
2009-06-30	6337
2009-09-30	5767
2009-12-31	5802
2010-03-31	5777
2010-06-30	6672
2010-09-30	6548
2010-12-31	6409
2011-03-31	7577
2011-06-30	8269
2011-09-30	8765
2011-12-31	9628
2012-03-31	10162
2012-06-30	11823
2012-09-30	12524
2012-12-31	12795
2013-03-31	14011
2013-06-30	11991
2013-09-30	10698
2013-12-31	13054
2014-03-31	12471
2014-06-30	12688
2014-09-30	12167
2014-12-31	10382
2015-03-31	11968
2015-06-30	11367
2015-09-30	11899
2015-12-31	11254
2016-03-31	12598
2016-06-30	10202
2016-09-30	10472
2016-12-31	8121
2017-03-31	8386
2017-06-30	9187
2017-09-30	7791
2017-12-31	7861
2018-03-31	7576
2018-06-30	6965
2018-09-30	6155
2018-12-31	5738
2019-03-31	5896
2019-06-30	5747
2019-09-30	5104
2019-12-31	4852
2020-03-31	4743
2020-06-30	4302
2020-09-30	4236
2020-12-31	4878
2021-03-31	5328
2021-06-30	5544
2021-09-30	5243
2021-12-31	5553
2022-03-31	5296
2022-06-30	4290
2022-09-30	3840
2022-12-31	5817
2023-03-31	5239
2023-06-30	4009
2023-09-30	3576