Quarter	US dollars
1999-09-30	-2648
1999-12-31	-2621
2000-03-31	-2586
2000-06-30	-2555
2000-09-30	-2486
2000-12-31	-2501
2001-03-31	-2412
2001-06-30	-2381
2001-09-30	-2460
2001-12-31	-2410
2002-03-31	-2386
2002-06-30	-2531
2002-09-30	-2536
2002-12-31	-2600
2003-03-31	-2629
2003-06-30	-2685
2003-09-30	-2725
2003-12-31	-2845
2004-03-31	-2838
2004-06-30	-2805
2004-09-30	-2821
2004-12-31	-2970
2005-03-31	-2890
2005-06-30	-2787
2005-09-30	-2773
2005-12-31	-2734
2006-03-31	-2756
2006-06-30	-2830
2006-09-30	-2831
2006-12-31	-2878
2007-03-31	-2889
2007-06-30	-2899
2007-09-30	-2978
2007-12-31	-3020
2008-03-31	-3146
2008-06-30	-3125
2008-09-30	-2979
2008-12-31	-2947
2009-03-31	-2681
2009-06-30	-2970
2009-09-30	-16056
2009-12-31	-15887
2010-03-31	-15386
2010-06-30	-14987
2010-09-30	-15771
2010-12-31	-15607
2011-03-31	-16068
2011-06-30	-16219
2011-09-30	-15826
2011-12-31	-15559
2012-03-31	-15699
2012-06-30	-15379
2012-09-30	-15629
2012-12-31	-15575
2013-03-31	-15181
2013-06-30	-15241
2013-09-30	-15547
2013-12-31	-15607
2014-03-31	-15664
2014-06-30	-15666
2014-09-30	-15025
2014-12-31	-14683
2015-03-31	-13980
2015-06-30	-14253
2015-09-30	-14226
2015-12-31	-14043
2016-03-31	-14277
2016-06-30	-14176
2016-09-30	-14145
2016-12-31	-13581
2017-03-31	-13751
2017-06-30	-14101
2017-09-30	-14323
2017-12-31	-14398
2018-03-31	-14732
2018-06-30	-14254
2018-09-30	-14140
2018-12-31	-14095
2019-03-31	-14069
2019-06-30	-14089
2019-09-30	-13816
2019-12-31	-14014
2020-03-31	-13831
2020-06-30	-13942
2020-09-30	-14265
2020-12-31	-14596
2021-03-31	-14362
2021-06-30	-14456
2021-09-30	-41494
2021-12-31	-41221
2022-03-31	-40714
2022-06-30	-39106
2022-09-30	-37695
2022-12-31	-39196
2023-03-31	-39620
2023-06-30	-39173
2023-09-30	-38729
2023-12-31	-39515