Quarter	US dollars
2004-12-31	32817
2005-03-31	38742
2005-06-30	38741
2005-09-30	60192
2005-12-31	67593
2006-03-31	71515
2006-06-30	71564
2006-09-30	70810
2006-12-31	83583
2007-03-31	91040
2007-06-30	99616
2007-09-30	106743
2007-12-31	112498
2008-03-31	112795
2008-06-30	117848
2008-09-30	111527
2008-12-31	99910
2009-03-31	97836
2009-06-30	97354
2009-09-30	96420
2009-12-31	101950
2010-03-31	90922
2010-06-30	95908
2010-09-30	103042
2010-12-31	89451
2011-03-31	73789
2011-06-30	70372
2011-09-30	68378
2011-12-31	68098
2012-03-31	66911
2012-06-30	65831
2012-09-30	66852
2012-12-31	68931
2013-03-31	72577
2013-06-30	72735
2013-09-30	68722
2013-12-31	65357
2014-03-31	73705
2014-06-30	72960
2014-09-30	68586
2014-12-31	69879
2015-03-31	65509
2015-06-30	65047
2015-09-30	62865
2015-12-31	59061
2016-03-31	56375
2016-06-30	58097
2016-09-30	53350
2016-12-31	56433
2017-03-31	58388
2017-06-30	59770
2017-09-30	58623
2017-12-31	61761
2018-03-31	57621
2018-06-30	59841
2018-09-30	64420
2018-12-31	66510
2019-03-31	57632
2019-06-30	62324
2019-09-30	60818
2019-12-31	61865
2020-03-31	60282
2020-06-30	52647
2020-09-30	53027
2020-12-31	59366
2021-03-31	62417
2021-06-30	65345
2021-09-30	61151
2021-12-31	59788
2022-03-31	64790
2022-06-30	60773
2022-09-30	56471
2022-12-31	61795
2023-03-31	58372
2023-06-30	60399
2023-09-30	59433