Quarter	US dollars
2004-12-31	43899
2005-03-31	51742
2005-06-30	53648
2005-09-30	55075
2005-12-31	42324
2006-03-31	53700
2006-06-30	45715
2006-09-30	48366
2006-12-31	51594
2007-03-31	59665
2007-06-30	58300
2007-09-30	64396
2007-12-31	54073
2008-03-31	55068
2008-06-30	56648
2008-09-30	50120
2008-12-31	40654
2009-03-31	39212
2009-06-30	39143
2009-09-30	39423
2009-12-31	32052
2010-03-31	26074
2010-06-30	26809
2010-09-30	27292
2010-12-31	23481
2011-03-31	31057
2011-06-30	16838
2011-09-30	17004
2011-12-31	17072
2012-03-31	20836
2012-06-30	19474
2012-09-30	18113
2012-12-31	17235
2013-03-31	16854
2013-06-30	16606
2013-09-30	14811
2013-12-31	14007
2014-03-31	16395
2014-06-30	21378
2014-09-30	15664
2014-12-31	13646
2015-03-31	14906
2015-06-30	15021
2015-09-30	12963
2015-12-31	12802
2016-03-31	11334
2016-06-30	10706
2016-09-30	9538
2016-12-31	9173
2017-03-31	8675
2017-06-30	10334
2017-09-30	10985
2017-12-31	10200
2018-03-31	12788
2018-06-30	14019
2018-09-30	11515
2018-12-31	10010
2019-03-31	11142
2019-06-30	9087
2019-09-30	8729
2019-12-31	7026
2020-03-31	9497
2020-06-30	8383
2020-09-30	7134
2020-12-31	7298
2021-03-31	7825
2021-06-30	7500
2021-09-30	7969
2021-12-31	6201
2022-03-31	7901
2022-06-30	7146
2022-09-30	8543
2022-12-31	7105
2023-03-31	6688
2023-06-30	9058
2023-09-30	9653