Quarter	US dollars
2004-12-31	17241
2005-03-31	15123
2005-06-30	13849
2005-09-30	11787
2005-12-31	8906
2006-03-31	14854
2006-06-30	16449
2006-09-30	20354
2006-12-31	19320
2007-03-31	9604
2007-06-30	9817
2007-09-30	11248
2007-12-31	12085
2008-03-31	15475
2008-06-30	8273
2008-09-30	7487
2008-12-31	13741
2009-03-31	24238
2009-06-30	26196
2009-09-30	26612
2009-12-31	21030
2010-03-31	18866
2010-06-30	17676
2010-09-30	17553
2010-12-31	17914
2011-03-31	12973
2011-06-30	14218
2011-09-30	10516
2011-12-31	11656
2012-03-31	12556
2012-06-30	9067
2012-09-30	10448
2012-12-31	10487
2013-03-31	10335
2013-06-30	11780
2013-09-30	10827
2013-12-31	11059
2014-03-31	11383
2014-06-30	11510
2014-09-30	14589
2014-12-31	15421
2015-03-31	35668
2015-06-30	37880
2015-09-30	39544
2015-12-31	37744
2016-03-31	36152
2016-06-30	32407
2016-09-30	31859
2016-12-31	25937
2017-03-31	26605
2017-06-30	29389
2017-09-30	31039
2017-12-31	28888
2018-03-31	29987
2018-06-30	31690
2018-09-30	30813
2018-12-31	28820
2019-03-31	29010
2019-06-30	33300
2019-09-30	35611
2019-12-31	34479
2020-03-31	35398
2020-06-30	32666
2020-09-30	30726
2020-12-31	28237
2021-03-31	22739
2021-06-30	24991
2021-09-30	24542
2021-12-31	26302
2022-03-31	25064
2022-06-30	22971
2022-09-30	24094
2022-12-31	23313
2023-03-31	25952
2023-06-30	36564
2023-09-30	37152