Quarter	US dollars
2004-12-31	13618
2005-03-31	16775
2005-06-30	12872
2005-09-30	18687
2005-12-31	13578
2006-03-31	16509
2006-06-30	16016
2006-09-30	19446
2006-12-31	15132
2007-03-31	16002
2007-06-30	22861
2007-09-30	28320
2007-12-31	29867
2008-03-31	33629
2008-06-30	33676
2008-09-30	30027
2008-12-31	26356
2009-03-31	26419
2009-06-30	26204
2009-09-30	28786
2009-12-31	33015
2010-03-31	37889
2010-06-30	42242
2010-09-30	42961
2010-12-31	47787
2011-03-31	51113
2011-06-30	54091
2011-09-30	51442
2011-12-31	48252
2012-03-31	45356
2012-06-30	45224
2012-09-30	48558
2012-12-31	49587
2013-03-31	53089
2013-06-30	53602
2013-09-30	54629
2013-12-31	56251
2014-03-31	55873
2014-06-30	53813
2014-09-30	54959
2014-12-31	52530
2015-03-31	50857
2015-06-30	47802
2015-09-30	43838
2015-12-31	41681
2016-03-31	42773
2016-06-30	42852
2016-09-30	44380
2016-12-31	43716
2017-03-31	51170
2017-06-30	51872
2017-09-30	53160
2017-12-31	53971
2018-03-31	58776
2018-06-30	56229
2018-09-30	56765
2018-12-31	57222
2019-03-31	57133
2019-06-30	54524
2019-09-30	53145
2019-12-31	53067
2020-03-31	56569
2020-06-30	52539
2020-09-30	52848
2020-12-31	57062
2021-03-31	62144
2021-06-30	60849
2021-09-30	60874
2021-12-31	62334
2022-03-31	61726
2022-06-30	58108
2022-09-30	55697
2022-12-31	51286
2023-03-31	54680
2023-06-30	54425
2023-09-30	55257