Quarter	US dollars
1999-09-30	23682
1999-12-31	23972
2000-03-31	24837
2000-06-30	24189
2000-09-30	24435
2000-12-31	24494
2001-03-31	23509
2001-06-30	23697
2001-09-30	25570
2001-12-31	29945
2002-03-31	32734
2002-06-30	37060
2002-09-30	37585
2002-12-31	42438
2003-03-31	44868
2003-06-30	50972
2003-09-30	55257
2003-12-31	60150
2004-03-31	62509
2004-06-30	64356
2004-09-30	67315
2004-12-31	78267
2005-03-31	83508
2005-06-30	83464
2005-09-30	85159
2005-12-31	81820
2006-03-31	91904
2006-06-30	99283
2006-09-30	104602
2006-12-31	111077
2007-03-31	121175
2007-06-30	135105
2007-09-30	156297
2007-12-31	159561
2008-03-31	175244
2008-06-30	183929
2008-09-30	161859
2008-12-31	106273
2009-03-31	99605
2009-06-30	106431
2009-09-30	109437
2009-12-31	98112
2010-03-31	97638
2010-06-30	101403
2010-09-30	102943
2010-12-31	103209
2011-03-31	106085
2011-06-30	104211
2011-09-30	90388
2011-12-31	84459
2012-03-31	79176
2012-06-30	76839
2012-09-30	80803
2012-12-31	78986
2013-03-31	77496
2013-06-30	72956
2013-09-30	73297
2013-12-31	63339
2014-03-31	56945
2014-06-30	58595
2014-09-30	53419
2014-12-31	51712
2015-03-31	48418
2015-06-30	47944
2015-09-30	43487
2015-12-31	44581
2016-03-31	48185
2016-06-30	49507
2016-09-30	45860
2016-12-31	47096
2017-03-31	48497
2017-06-30	49858
2017-09-30	51512
2017-12-31	50384
2018-03-31	54281
2018-06-30	56076
2018-09-30	58999
2018-12-31	59802
2019-03-31	60371
2019-06-30	61843
2019-09-30	63783
2019-12-31	64092
2020-03-31	60972
2020-06-30	63936
2020-09-30	64477
2020-12-31	73021
2021-03-31	71336
2021-06-30	68323
2021-09-30	68818
2021-12-31	73690
2022-03-31	79633
2022-06-30	77488
2022-09-30	76163
2022-12-31	75038
2023-03-31	78837
2023-06-30	81079
2023-09-30	80972