Quarter	US dollars
2004-12-31	13046
2005-03-31	11923
2005-06-30	15469
2005-09-30	14596
2005-12-31	13458
2006-03-31	11375
2006-06-30	17736
2006-09-30	16737
2006-12-31	19374
2007-03-31	23585
2007-06-30	26980
2007-09-30	31215
2007-12-31	36013
2008-03-31	56507
2008-06-30	47348
2008-09-30	38313
2008-12-31	85014
2009-03-31	73743
2009-06-30	57748
2009-09-30	60466
2009-12-31	50869
2010-03-31	50321
2010-06-30	50938
2010-09-30	56805
2010-12-31	49545
2011-03-31	37969
2011-06-30	40187
2011-09-30	52282
2011-12-31	51307
2012-03-31	47999
2012-06-30	43467
2012-09-30	32235
2012-12-31	33128
2013-03-31	30924
2013-06-30	28305
2013-09-30	9360
2013-12-31	7469
2014-03-31	5259
2014-06-30	5355
2014-09-30	5744
2014-12-31	6184
2015-03-31	6188
2015-06-30	5878
2015-09-30	5209
2015-12-31	4564
2016-03-31	5974
2016-06-30	6044
2016-09-30	4566
2016-12-31	3553
2017-03-31	3466
2017-06-30	3411
2017-09-30	3284
2017-12-31	5254
2018-03-31	6757
2018-06-30	3416
2018-09-30	4142
2018-12-31	4181
2019-03-31	3763
2019-06-30	5397
2019-09-30	5378
2019-12-31	4872
2020-03-31	6240
2020-06-30	5988
2020-09-30	5768
2020-12-31	5769
2021-03-31	5025
2021-06-30	4269
2021-09-30	3832
2021-12-31	4019
2022-03-31	4765
2022-06-30	4766
2022-09-30	5867
2022-12-31	5648
2023-03-31	5544
2023-06-30	5823
2023-09-30	4838