Quarter	US dollars
2004-12-31	5621
2005-03-31	4545
2005-06-30	5352
2005-09-30	4984
2005-12-31	4207
2006-03-31	4851
2006-06-30	5887
2006-09-30	4788
2006-12-31	6325
2007-03-31	8679
2007-06-30	10931
2007-09-30	11269
2007-12-31	13885
2008-03-31	18351
2008-06-30	20653
2008-09-30	14567
2008-12-31	29566
2009-03-31	23235
2009-06-30	19839
2009-09-30	20932
2009-12-31	17661
2010-03-31	18132
2010-06-30	19057
2010-09-30	22624
2010-12-31	17692
2011-03-31	16496
2011-06-30	16700
2011-09-30	20687
2011-12-31	19925
2012-03-31	19083
2012-06-30	19766
2012-09-30	14363
2012-12-31	14055
2013-03-31	12594
2013-06-30	11299
2013-09-30	10662
2013-12-31	10262
2014-03-31	16861
2014-06-30	18290
2014-09-30	18615
2014-12-31	20187
2015-03-31	21334
2015-06-30	16526
2015-09-30	13323
2015-12-31	12472
2016-03-31	15534
2016-06-30	16847
2016-09-30	15652
2016-12-31	12622
2017-03-31	11767
2017-06-30	11405
2017-09-30	11540
2017-12-31	9239
2018-03-31	8879
2018-06-30	6063
2018-09-30	7488
2018-12-31	10168
2019-03-31	10862
2019-06-30	10615
2019-09-30	12395
2019-12-31	10202
2020-03-31	12330
2020-06-30	12160
2020-09-30	11814
2020-12-31	12906
2021-03-31	11106
2021-06-30	11178
2021-09-30	9917
2021-12-31	9947
2022-03-31	9167
2022-06-30	8150
2022-09-30	8927
2022-12-31	8402
2023-03-31	7833
2023-06-30	8121
2023-09-30	7605