Quarter	US dollars
1999-09-30	8666
1999-12-31	8804
2000-03-31	10035
2000-06-30	10929
2000-09-30	12681
2000-12-31	13404
2001-03-31	13439
2001-06-30	14672
2001-09-30	15493
2001-12-31	17405
2002-03-31	23267
2002-06-30	23334
2002-09-30	23570
2002-12-31	22669
2003-03-31	24106
2003-06-30	27853
2003-09-30	30331
2003-12-31	29910
2004-03-31	26784
2004-06-30	26886
2004-09-30	27119
2004-12-31	16916
2005-03-31	13968
2005-06-30	12648
2005-09-30	12217
2005-12-31	11245
2006-03-31	13827
2006-06-30	12962
2006-09-30	11856
2006-12-31	8458
2007-03-31	12309
2007-06-30	7895
2007-09-30	15975
2007-12-31	10568
2008-03-31	14151
2008-06-30	11455
2008-09-30	11562
2008-12-31	10589
2009-03-31	15132
2009-06-30	16916
2009-09-30	17655
2009-12-31	17395
2010-03-31	20512
2010-06-30	20492
2010-09-30	19106
2010-12-31	18482
2011-03-31	24975
2011-06-30	33464
2011-09-30	36974
2011-12-31	35633
2012-03-31	43080
2012-06-30	43846
2012-09-30	44353
2012-12-31	43026
2013-03-31	45664
2013-06-30	43030
2013-09-30	48112
2013-12-31	45085
2014-03-31	51658
2014-06-30	51353
2014-09-30	53905
2014-12-31	50698
2015-03-31	51712
2015-06-30	55284
2015-09-30	59234
2015-12-31	53780
2016-03-31	60570
2016-06-30	57402
2016-09-30	55881
2016-12-31	51965
2017-03-31	50203
2017-06-30	51260
2017-09-30	47506
2017-12-31	43135
2018-03-31	46967
2018-06-30	42902
2018-09-30	43563
2018-12-31	42809
2019-03-31	52594
2019-06-30	54351
2019-09-30	54841
2019-12-31	50240
2020-03-31	53867
2020-06-30	58069
2020-09-30	60868
2020-12-31	60546
2021-03-31	60209
2021-06-30	59605
2021-09-30	58082
2021-12-31	62932
2022-03-31	67817
2022-06-30	66210
2022-09-30	59496
2022-12-31	62731
2023-03-31	64344
2023-06-30	63253
2023-09-30	66880