Quarter	US dollars
1999-09-30	31869
1999-12-31	32262
2000-03-31	36758
2000-06-30	36207
2000-09-30	36260
2000-12-31	39682
2001-03-31	38992
2001-06-30	39441
2001-09-30	38129
2001-12-31	35536
2002-03-31	30476
2002-06-30	26993
2002-09-30	25149
2002-12-31	42799
2003-03-31	39878
2003-06-30	39013
2003-09-30	39143
2003-12-31	39078
2004-03-31	38576
2004-06-30	37808
2004-09-30	40284
2004-12-31	42964
2005-03-31	46211
2005-06-30	51879
2005-09-30	52984
2005-12-31	53918
2006-03-31	57434
2006-06-30	61206
2006-09-30	62602
2006-12-31	74476
2007-03-31	75785
2007-06-30	81378
2007-09-30	86510
2007-12-31	93001
2008-03-31	102589
2008-06-30	111046
2008-09-30	107329
2008-12-31	89831
2009-03-31	88983
2009-06-30	97950
2009-09-30	104669
2009-12-31	104755
2010-03-31	115994
2010-06-30	117684
2010-09-30	136397
2010-12-31	141449
2011-03-31	149669
2011-06-30	172382
2011-09-30	152799
2011-12-31	151094
2012-03-31	161857
2012-06-30	148084
2012-09-30	148493
2012-12-31	145955
2013-03-31	141279
2013-06-30	126603
2013-09-30	140164
2013-12-31	130146
2014-03-31	132068
2014-06-30	133741
2014-09-30	132071
2014-12-31	129834
2015-03-31	122820
2015-06-30	113551
2015-09-30	97468
2015-12-31	93297
2016-03-31	99602
2016-06-30	97105
2016-09-30	57731
2016-12-31	52683
2017-03-31	55993
2017-06-30	55491
2017-09-30	58664
2017-12-31	57874
2018-03-31	62650
2018-06-30	57782
2018-09-30	61242
2018-12-31	64166
2019-03-31	67996
2019-06-30	68515
2019-09-30	68569
2019-12-31	66931
2020-03-31	56106
2020-06-30	54670
2020-09-30	51675
2020-12-31	59495
2021-03-31	56633
2021-06-30	59111
2021-09-30	57718
2021-12-31	72489
2022-03-31	70067
2022-06-30	57807
2022-09-30	76932
2022-12-31	79669
2023-03-31	84495
2023-06-30	87421
2023-09-30	71603