Quarter	US dollars
1999-09-30	8393
1999-12-31	7904
2000-03-31	7935
2000-06-30	7104
2000-09-30	6871
2000-12-31	7064
2001-03-31	8695
2001-06-30	8950
2001-09-30	8871
2001-12-31	8968
2002-03-31	9591
2002-06-30	9947
2002-09-30	9451
2002-12-31	8510
2003-03-31	8717
2003-06-30	8366
2003-09-30	9814
2003-12-31	10319
2004-03-31	11101
2004-06-30	10636
2004-09-30	10637
2004-12-31	16811
2005-03-31	11834
2005-06-30	12564
2005-09-30	12803
2005-12-31	11372
2006-03-31	15345
2006-06-30	15785
2006-09-30	16711
2006-12-31	18500
2007-03-31	21647
2007-06-30	18668
2007-09-30	22837
2007-12-31	20849
2008-03-31	21197
2008-06-30	17234
2008-09-30	23385
2008-12-31	14346
2009-03-31	15434
2009-06-30	14803
2009-09-30	19705
2009-12-31	15835
2010-03-31	21523
2010-06-30	20440
2010-09-30	22038
2010-12-31	17981
2011-03-31	21166
2011-06-30	16523
2011-09-30	24303
2011-12-31	16030
2012-03-31	16486
2012-06-30	14955
2012-09-30	14902
2012-12-31	16284
2013-03-31	13819
2013-06-30	16458
2013-09-30	14806
2013-12-31	15293
2014-03-31	14924
2014-06-30	15175
2014-09-30	14542
2014-12-31	13332
2015-03-31	16256
2015-06-30	13807
2015-09-30	12890
2015-12-31	12245
2016-03-31	13198
2016-06-30	14066
2016-09-30	13780
2016-12-31	12356
2017-03-31	11564
2017-06-30	13342
2017-09-30	11155
2017-12-31	11636
2018-03-31	13667
2018-06-30	11365
2018-09-30	10743
2018-12-31	9080
2019-03-31	12846
2019-06-30	11440
2019-09-30	13460
2019-12-31	11972
2020-03-31	13487
2020-06-30	13465
2020-09-30	14136
2020-12-31	15511
2021-03-31	13717
2021-06-30	14397
2021-09-30	15751
2021-12-31	13516
2022-03-31	12697
2022-06-30	11732
2022-09-30	12008
2022-12-31	10862
2023-03-31	11188
2023-06-30	13237
2023-09-30	12539