Quarter	US dollars
2004-12-31	5658
2005-03-31	4650
2005-06-30	3788
2005-09-30	3707
2005-12-31	3624
2006-03-31	4175
2006-06-30	4091
2006-09-30	4656
2006-12-31	4638
2007-03-31	4793
2007-06-30	4841
2007-09-30	4725
2007-12-31	4832
2008-03-31	6259
2008-06-30	5298
2008-09-30	5692
2008-12-31	6576
2009-03-31	5741
2009-06-30	5681
2009-09-30	6687
2009-12-31	6886
2010-03-31	6479
2010-06-30	6595
2010-09-30	8148
2010-12-31	7239
2011-03-31	7746
2011-06-30	7256
2011-09-30	7042
2011-12-31	7545
2012-03-31	7175
2012-06-30	6678
2012-09-30	6125
2012-12-31	7117
2013-03-31	6904
2013-06-30	7802
2013-09-30	8367
2013-12-31	7195
2014-03-31	6616
2014-06-30	6697
2014-09-30	6809
2014-12-31	6537
2015-03-31	6677
2015-06-30	6853
2015-09-30	6392
2015-12-31	6190
2016-03-31	6523
2016-06-30	6531
2016-09-30	5859
2016-12-31	4931
2017-03-31	5087
2017-06-30	4288
2017-09-30	4459
2017-12-31	4933
2018-03-31	5014
2018-06-30	4750
2018-09-30	4486
2018-12-31	4338
2019-03-31	4607
2019-06-30	5114
2019-09-30	5544
2019-12-31	5391
2020-03-31	4770
2020-06-30	5030
2020-09-30	4421
2020-12-31	4553
2021-03-31	4464
2021-06-30	4629
2021-09-30	4272
2021-12-31	4574
2022-03-31	4884
2022-06-30	4679
2022-09-30	4499
2022-12-31	4662
2023-03-31	4398
2023-06-30	4450
2023-09-30	4004