Quarter	US dollars
2004-12-31	12124
2005-03-31	15308
2005-06-30	12605
2005-09-30	14702
2005-12-31	12929
2006-03-31	15893
2006-06-30	15372
2006-09-30	17787
2006-12-31	19265
2007-03-31	18762
2007-06-30	18890
2007-09-30	26981
2007-12-31	24160
2008-03-31	32675
2008-06-30	28514
2008-09-30	33507
2008-12-31	26784
2009-03-31	25955
2009-06-30	23923
2009-09-30	22860
2009-12-31	23206
2010-03-31	25261
2010-06-30	29952
2010-09-30	34388
2010-12-31	32434
2011-03-31	32030
2011-06-30	30473
2011-09-30	36231
2011-12-31	27069
2012-03-31	29968
2012-06-30	36064
2012-09-30	36040
2012-12-31	35270
2013-03-31	31948
2013-06-30	29790
2013-09-30	34637
2013-12-31	29069
2014-03-31	30980
2014-06-30	31072
2014-09-30	30454
2014-12-31	32554
2015-03-31	34347
2015-06-30	33695
2015-09-30	36968
2015-12-31	38611
2016-03-31	39154
2016-06-30	42656
2016-09-30	44424
2016-12-31	41640
2017-03-31	38339
2017-06-30	44593
2017-09-30	52705
2017-12-31	52485
2018-03-31	51145
2018-06-30	47824
2018-09-30	49981
2018-12-31	48826
2019-03-31	48495
2019-06-30	52135
2019-09-30	52572
2019-12-31	51156
2020-03-31	54566
2020-06-30	51708
2020-09-30	46233
2020-12-31	52935
2021-03-31	47333
2021-06-30	48961
2021-09-30	45750
2021-12-31	53932
2022-03-31	50533
2022-06-30	50921
2022-09-30	57249
2022-12-31	59192
2023-03-31	57342
2023-06-30	57444
2023-09-30	53096