Quarter	US dollars
2004-12-31	35516
2005-03-31	43292
2005-06-30	43101
2005-09-30	40907
2005-12-31	39013
2006-03-31	43670
2006-06-30	45911
2006-09-30	48168
2006-12-31	41876
2007-03-31	41362
2007-06-30	35702
2007-09-30	44138
2007-12-31	37877
2008-03-31	39235
2008-06-30	39221
2008-09-30	37442
2008-12-31	35536
2009-03-31	43053
2009-06-30	52526
2009-09-30	47274
2009-12-31	70543
2010-03-31	63912
2010-06-30	77530
2010-09-30	94021
2010-12-31	97167
2011-03-31	83043
2011-06-30	73389
2011-09-30	60403
2011-12-31	54536
2012-03-31	58598
2012-06-30	49420
2012-09-30	45934
2012-12-31	24435
2013-03-31	35124
2013-06-30	36684
2013-09-30	44349
2013-12-31	49835
2014-03-31	41329
2014-06-30	39771
2014-09-30	36910
2014-12-31	40915
2015-03-31	54885
2015-06-30	51039
2015-09-30	53987
2015-12-31	48626
2016-03-31	49140
2016-06-30	50246
2016-09-30	41945
2016-12-31	44105
2017-03-31	41940
2017-06-30	48624
2017-09-30	54930
2017-12-31	46373
2018-03-31	48074
2018-06-30	50190
2018-09-30	49964
2018-12-31	49742
2019-03-31	45823
2019-06-30	44705
2019-09-30	48336
2019-12-31	48667
2020-03-31	53512
2020-06-30	51700
2020-09-30	41328
2020-12-31	36059
2021-03-31	32695
2021-06-30	39585
2021-09-30	44353
2021-12-31	49050
2022-03-31	46354
2022-06-30	35342
2022-09-30	39059
2022-12-31	35693
2023-03-31	41803
2023-06-30	58164
2023-09-30	56102