Quarter	US dollars
2004-12-31	70382
2005-03-31	71000
2005-06-30	69721
2005-09-30	76163
2005-12-31	74562
2006-03-31	83790
2006-06-30	96263
2006-09-30	99908
2006-12-31	106594
2007-03-31	127922
2007-06-30	135219
2007-09-30	147597
2007-12-31	159344
2008-03-31	180505
2008-06-30	180086
2008-09-30	163166
2008-12-31	159940
2009-03-31	151744
2009-06-30	151487
2009-09-30	152776
2009-12-31	143091
2010-03-31	134583
2010-06-30	127497
2010-09-30	135216
2010-12-31	128758
2011-03-31	134218
2011-06-30	136568
2011-09-30	128144
2011-12-31	125887
2012-03-31	130362
2012-06-30	115852
2012-09-30	112194
2012-12-31	110722
2013-03-31	108650
2013-06-30	105784
2013-09-30	111429
2013-12-31	117063
2014-03-31	118287
2014-06-30	117762
2014-09-30	109549
2014-12-31	100923
2015-03-31	83676
2015-06-30	82909
2015-09-30	77339
2015-12-31	78404
2016-03-31	75799
2016-06-30	74707
2016-09-30	78779
2016-12-31	70746
2017-03-31	72836
2017-06-30	72683
2017-09-30	74518
2017-12-31	78928
2018-03-31	80267
2018-06-30	67565
2018-09-30	62640
2018-12-31	63369
2019-03-31	59494
2019-06-30	64033
2019-09-30	60463
2019-12-31	62454
2020-03-31	60833
2020-06-30	62865
2020-09-30	64333
2020-12-31	66048
2021-03-31	62649
2021-06-30	58439
2021-09-30	60314
2021-12-31	58382
2022-03-31	57710
2022-06-30	56015
2022-09-30	49811
2022-12-31	44151
2023-03-31	42914
2023-06-30	41077
2023-09-30	37014