Quarter	US dollars
2004-12-31	15609
2005-03-31	17329
2005-06-30	13951
2005-09-30	18509
2005-12-31	13460
2006-03-31	14320
2006-06-30	15481
2006-09-30	15538
2006-12-31	12848
2007-03-31	13917
2007-06-30	14286
2007-09-30	19749
2007-12-31	18997
2008-03-31	24882
2008-06-30	26526
2008-09-30	26790
2008-12-31	14001
2009-03-31	16750
2009-06-30	13285
2009-09-30	15702
2009-12-31	20878
2010-03-31	17574
2010-06-30	16663
2010-09-30	19284
2010-12-31	18022
2011-03-31	20972
2011-06-30	20976
2011-09-30	20363
2011-12-31	18109
2012-03-31	20630
2012-06-30	24502
2012-09-30	27101
2012-12-31	25638
2013-03-31	27593
2013-06-30	25449
2013-09-30	32629
2013-12-31	32435
2014-03-31	38385
2014-06-30	38926
2014-09-30	36274
2014-12-31	30456
2015-03-31	31014
2015-06-30	34262
2015-09-30	33919
2015-12-31	27320
2016-03-31	26773
2016-06-30	29701
2016-09-30	28280
2016-12-31	27120
2017-03-31	28730
2017-06-30	33847
2017-09-30	33571
2017-12-31	31619
2018-03-31	32559
2018-06-30	35645
2018-09-30	35455
2018-12-31	34438
2019-03-31	37964
2019-06-30	36630
2019-09-30	35897
2019-12-31	34783
2020-03-31	33465
2020-06-30	30799
2020-09-30	34082
2020-12-31	37961
2021-03-31	39910
2021-06-30	39083
2021-09-30	39066
2021-12-31	37904
2022-03-31	42329
2022-06-30	39270
2022-09-30	38513
2022-12-31	38946
2023-03-31	37916
2023-06-30	44187
2023-09-30	44060