Quarter	US dollars
1999-09-30	15376
1999-12-31	13286
2000-03-31	12760
2000-06-30	15085
2000-09-30	9952
2000-12-31	14941
2001-03-31	11273
2001-06-30	11668
2001-09-30	11839
2001-12-31	15055
2002-03-31	14919
2002-06-30	18078
2002-09-30	19891
2002-12-31	20845
2003-03-31	24523
2003-06-30	27350
2003-09-30	28727
2003-12-31	26073
2004-03-31	27894
2004-06-30	26110
2004-09-30	25692
2004-12-31	21743
2005-03-31	28522
2005-06-30	31055
2005-09-30	33438
2005-12-31	29344
2006-03-31	35802
2006-06-30	38384
2006-09-30	40424
2006-12-31	47003
2007-03-31	48880
2007-06-30	43370
2007-09-30	39837
2007-12-31	40202
2008-03-31	53831
2008-06-30	51705
2008-09-30	41108
2008-12-31	42636
2009-03-31	40535
2009-06-30	42711
2009-09-30	51293
2009-12-31	157642
2010-03-31	152128
2010-06-30	161070
2010-09-30	157299
2010-12-31	158728
2011-03-31	151778
2011-06-30	136025
2011-09-30	123889
2011-12-31	114077
2012-03-31	108754
2012-06-30	102958
2012-09-30	98002
2012-12-31	33714
2013-03-31	38795
2013-06-30	34839
2013-09-30	36712
2013-12-31	30185
2014-03-31	60213
2014-06-30	58930
2014-09-30	59795
2014-12-31	54697
2015-03-31	56572
2015-06-30	46594
2015-09-30	43920
2015-12-31	39780
2016-03-31	43493
2016-06-30	47400
2016-09-30	38992
2016-12-31	38986
2017-03-31	38705
2017-06-30	44601
2017-09-30	43169
2017-12-31	41199
2018-03-31	45554
2018-06-30	51160
2018-09-30	46023
2018-12-31	45321
2019-03-31	61689
2019-06-30	57898
2019-09-30	61885
2019-12-31	56297
2020-03-31	55936
2020-06-30	65326
2020-09-30	32941
2020-12-31	35390
2021-03-31	40625
2021-06-30	56866
2021-09-30	61151
2021-12-31	55624
2022-03-31	58520
2022-06-30	51132
2022-09-30	45844
2022-12-31	49199
2023-03-31	53085
2023-06-30	53576
2023-09-30	54252