Quarter	US dollars
2004-12-31	30296
2005-03-31	35683
2005-06-30	33688
2005-09-30	31437
2005-12-31	36035
2006-03-31	30088
2006-06-30	45906
2006-09-30	32282
2006-12-31	27566
2007-03-31	31016
2007-06-30	40264
2007-09-30	43535
2007-12-31	43465
2008-03-31	61310
2008-06-30	45082
2008-09-30	51569
2008-12-31	38774
2009-03-31	37905
2009-06-30	44380
2009-09-30	50312
2009-12-31	50559
2010-03-31	47230
2010-06-30	63295
2010-09-30	65210
2010-12-31	54251
2011-03-31	48438
2011-06-30	54106
2011-09-30	44276
2011-12-31	39579
2012-03-31	55293
2012-06-30	62129
2012-09-30	60229
2012-12-31	56569
2013-03-31	45552
2013-06-30	43138
2013-09-30	41638
2013-12-31	40249
2014-03-31	23492
2014-06-30	33064
2014-09-30	33043
2014-12-31	34239
2015-03-31	36311
2015-06-30	34612
2015-09-30	36578
2015-12-31	33172
2016-03-31	37964
2016-06-30	44371
2016-09-30	44870
2016-12-31	59773
2017-03-31	64291
2017-06-30	49856
2017-09-30	56754
2017-12-31	52653
2018-03-31	61458
2018-06-30	59876
2018-09-30	62599
2018-12-31	51965
2019-03-31	54309
2019-06-30	45487
2019-09-30	47022
2019-12-31	50944
2020-03-31	54655
2020-06-30	50625
2020-09-30	44291
2020-12-31	40806
2021-03-31	45492
2021-06-30	59524
2021-09-30	60497
2021-12-31	66027
2022-03-31	60899
2022-06-30	51674
2022-09-30	49474
2022-12-31	48098
2023-03-31	43159
2023-06-30	42774
2023-09-30	37934