Quarter	US dollars
2004-12-31	42209
2005-03-31	32513
2005-06-30	32554
2005-09-30	40028
2005-12-31	29718
2006-03-31	23105
2006-06-30	25795
2006-09-30	31985
2006-12-31	32748
2007-03-31	31304
2007-06-30	34751
2007-09-30	35359
2007-12-31	33955
2008-03-31	27008
2008-06-30	32550
2008-09-30	35895
2008-12-31	30141
2009-03-31	49976
2009-06-30	42649
2009-09-30	68172
2009-12-31	55460
2010-03-31	43033
2010-06-30	37294
2010-09-30	55870
2010-12-31	33048
2011-03-31	43579
2011-06-30	40763
2011-09-30	66046
2011-12-31	68941
2012-03-31	44170
2012-06-30	47152
2012-09-30	44085
2012-12-31	52389
2013-03-31	50752
2013-06-30	58749
2013-09-30	61013
2013-12-31	65543
2014-03-31	71654
2014-06-30	72842
2014-09-30	69973
2014-12-31	70430
2015-03-31	63159
2015-06-30	57293
2015-09-30	58367
2015-12-31	57967
2016-03-31	58080
2016-06-30	56259
2016-09-30	57145
2016-12-31	51388
2017-03-31	53460
2017-06-30	52704
2017-09-30	47797
2017-12-31	35485
2018-03-31	51156
2018-06-30	39315
2018-09-30	42949
2018-12-31	32921
2019-03-31	41190
2019-06-30	42984
2019-09-30	40301
2019-12-31	45619
2020-03-31	38529
2020-06-30	43333
2020-09-30	42493
2020-12-31	45904
2021-03-31	41732
2021-06-30	31282
2021-09-30	30537
2021-12-31	29799
2022-03-31	24298
2022-06-30	22080
2022-09-30	18708
2022-12-31	18628
2023-03-31	16246
2023-06-30	16503
2023-09-30	22844