Quarter	US dollars
1999-09-30	-1518
1999-12-31	-8841
2000-01-31	-4640
2000-02-29	-3454
2000-03-31	-4409
2000-04-30	-6072
2000-05-31	-7915
2000-06-30	-9107
2000-07-31	-9658
2000-08-31	-10443
2000-09-30	-11348
2000-10-31	-12052
2000-11-30	-14583
2000-12-31	-15562
2001-01-31	-15139
2001-02-28	-14102
2001-03-31	-15614
2001-04-30	-15618
2001-05-31	-15673
2001-06-30	-15159
2001-07-31	-15579
2001-08-31	-16666
2001-09-30	-16730
2001-10-31	-16260
2001-11-30	-16655
2001-12-31	-15866
2002-03-31	-17205
2002-06-30	-20011
2002-09-30	-19348
2002-12-31	-21383
2003-03-31	-23352
2003-06-30	-19351
2003-09-30	-21771
2003-12-31	-21901
2004-03-31	-21277
2004-06-30	-21154
2004-09-30	-21079
2004-12-31	-24108
2005-03-31	-23328
2005-06-30	-23008
2005-09-30	-22158
2005-12-31	-21659
2006-03-31	-22391
2006-06-30	-21296
2006-09-30	-23612
2006-12-31	-24974
2007-03-31	-23828
2007-06-30	-24116
2007-09-30	-22802
2007-12-31	-27251
2008-03-31	-28059
2008-06-30	-28078
2008-09-30	-24438
2008-12-31	-22937
2009-03-31	-18335
2009-06-30	-19907
2009-09-30	-17663
2009-12-31	-17545
2010-03-31	-20822
2010-06-30	-21374
2010-09-30	-23884
2010-12-31	-24828
2011-03-31	-28301
2011-06-30	-32397
2011-09-30	-32856
2011-12-31	-34677
2012-03-31	-35376
2012-06-30	-38121
2012-09-30	-38603
2012-12-31	-40290
2013-03-31	-40671
2013-06-30	-42580
2013-09-30	-44779
2013-12-31	-47578
2014-03-31	-51291
2014-06-30	-51667
2014-09-30	-50408
2014-12-31	-53355
2015-03-31	-71279
2015-06-30	-71558
2015-09-30	-78859
2015-12-31	-80610
2016-03-31	-86599
2016-06-30	-90179
2016-09-30	-94118
2016-12-31	-85721
2017-03-31	-92327
2017-06-30	-95277
2017-09-30	-94780
2017-12-31	-98546
2018-03-31	-100019
2018-06-30	-97870
2018-09-30	-95624
2018-12-31	-108225
2019-03-31	-99688
2019-06-30	-90949
2019-09-30	-81749
2019-12-31	-96987
2020-03-31	-83445
2020-06-30	-81736
2020-09-30	-72971
2020-12-31	-80710
2021-03-31	-73861
2021-06-30	-71330
2021-09-30	-70356
2021-12-31	-73304
2022-03-31	-72293
2022-06-30	-63604
2022-09-30	-55454
2022-12-31	-64609
2023-03-31	-62292
2023-06-30	-61608
2023-09-30	-61459
2023-12-31	-65083