Quarter	US dollars
1999-09-30	-7348
1999-12-31	-8034
2000-03-31	-9448
2000-06-30	-9822
2000-09-30	-8383
2000-12-31	-9102
2001-03-31	-9084
2001-06-30	-9791
2001-09-30	-9450
2001-12-31	-10302
2002-03-31	-11737
2002-06-30	-13149
2002-09-30	-14355
2002-12-31	-15800
2003-03-31	-17134
2003-06-30	-18809
2003-09-30	-18171
2003-12-31	-20516
2004-03-31	-20245
2004-06-30	-22041
2004-09-30	-24651
2004-12-31	-26169
2005-03-31	-29544
2005-06-30	-31717
2005-09-30	-31431
2005-12-31	-30509
2006-03-31	-30245
2006-06-30	-30028
2006-09-30	-30231
2006-12-31	-32149
2007-03-31	-30484
2007-06-30	-41933
2007-09-30	-35507
2007-12-31	-40304
2008-03-31	-42893
2008-06-30	-26555
2008-09-30	-58422
2008-12-31	-49370
2009-03-31	-33478
2009-06-30	-24868
2009-09-30	-22138
2009-12-31	-17898
2010-03-31	-24813
2010-06-30	-24240
2010-09-30	-24409
2010-12-31	-27498
2011-03-31	-28787
2011-06-30	-23730
2011-09-30	-28556
2011-12-31	-27736
2012-03-31	-26575
2012-06-30	-26800
2012-09-30	-27650
2012-12-31	-29047
2013-03-31	-25108
2013-06-30	-24655
2013-09-30	-24711
2013-12-31	-24408
2014-03-31	-25976
2014-06-30	-26386
2014-09-30	-25901
2014-12-31	-25379
2015-03-31	-25498
2015-06-30	-24965
2015-09-30	-25462
2015-12-31	-25394
2016-03-31	-25489
2016-06-30	-25127
2016-09-30	-25554
2016-12-31	-21963
2017-03-31	-19953
2017-06-30	-22019
2017-09-30	-24877
2017-12-31	-25643
2018-03-31	-26718
2018-06-30	-24864
2018-09-30	-20712
2018-12-31	-20788
2019-03-31	-19204
2019-06-30	-21658
2019-09-30	-23940
2019-12-31	-25590
2020-03-31	-22239
2020-06-30	-29755
2020-09-30	-34550
2020-12-31	-36443
2021-03-31	-34165
2021-06-30	-27187
2021-09-30	-27772
2021-12-31	-35475
2022-03-31	-30964
2022-06-30	-26482
2022-09-30	-20679
2022-12-31	-22601
2023-03-31	-24575
2023-06-30	-22549
2023-09-30	-21697
2023-12-31	-23563