Quarter	US dollars
2004-12-31	48963
2005-03-31	41426
2005-06-30	40657
2005-09-30	39671
2005-12-31	42360
2006-03-31	49531
2006-06-30	49810
2006-09-30	51383
2006-12-31	53191
2007-03-31	52045
2007-06-30	56099
2007-09-30	63504
2007-12-31	67067
2008-03-31	65452
2008-06-30	65749
2008-09-30	57412
2008-12-31	62350
2009-03-31	58531
2009-06-30	60401
2009-09-30	53431
2009-12-31	50385
2010-03-31	42738
2010-06-30	48248
2010-09-30	63110
2010-12-31	63695
2011-03-31	52984
2011-06-30	50833
2011-09-30	38882
2011-12-31	37504
2012-03-31	38076
2012-06-30	39282
2012-09-30	41514
2012-12-31	42431
2013-03-31	48098
2013-06-30	54101
2013-09-30	62826
2013-12-31	66925
2014-03-31	61325
2014-06-30	57908
2014-09-30	57172
2014-12-31	59758
2015-03-31	51663
2015-06-30	48477
2015-09-30	44753
2015-12-31	39220
2016-03-31	42694
2016-06-30	42508
2016-09-30	39134
2016-12-31	46204
2017-03-31	45268
2017-06-30	45933
2017-09-30	54590
2017-12-31	57061
2018-03-31	56119
2018-06-30	53888
2018-09-30	52418
2018-12-31	52869
2019-03-31	51979
2019-06-30	45407
2019-09-30	42881
2019-12-31	42948
2020-03-31	41856
2020-06-30	38191
2020-09-30	35759
2020-12-31	35172
2021-03-31	38736
2021-06-30	42872
2021-09-30	48119
2021-12-31	48094
2022-03-31	47261
2022-06-30	36810
2022-09-30	34843
2022-12-31	36182
2023-03-31	41146
2023-06-30	42429
2023-09-30	39321