Quarter	US dollars
1999-09-30	9160
1999-12-31	10073
2000-03-31	6780
2000-06-30	8750
2000-09-30	8251
2000-12-31	11952
2001-03-31	10951
2001-06-30	10843
2001-09-30	13934
2001-12-31	12855
2002-03-31	13037
2002-06-30	14628
2002-09-30	13858
2002-12-31	15288
2003-03-31	13642
2003-06-30	13123
2003-09-30	11918
2003-12-31	12528
2004-03-31	12491
2004-06-30	13224
2004-09-30	14084
2004-12-31	16913
2005-03-31	16749
2005-06-30	16831
2005-09-30	16087
2005-12-31	17301
2006-03-31	17997
2006-06-30	17804
2006-09-30	18217
2006-12-31	20638
2007-03-31	19670
2007-06-30	20361
2007-09-30	19263
2007-12-31	21735
2008-03-31	20592
2008-06-30	19184
2008-09-30	15448
2008-12-31	16210
2009-03-31	14043
2009-06-30	15812
2009-09-30	14499
2009-12-31	14165
2010-03-31	11241
2010-06-30	10124
2010-09-30	13504
2010-12-31	13076
2011-03-31	15155
2011-06-30	19281
2011-09-30	19809
2011-12-31	19171
2012-03-31	20172
2012-06-30	19153
2012-09-30	19610
2012-12-31	20415
2013-03-31	20783
2013-06-30	22814
2013-09-30	24132
2013-12-31	26498
2014-03-31	28429
2014-06-30	28454
2014-09-30	24587
2014-12-31	24954
2015-03-31	31564
2015-06-30	32545
2015-09-30	34124
2015-12-31	35041
2016-03-31	39772
2016-06-30	38739
2016-09-30	40414
2016-12-31	36261
2017-03-31	42798
2017-06-30	47744
2017-09-30	44773
2017-12-31	47627
2018-03-31	50624
2018-06-30	44863
2018-09-30	43041
2018-12-31	57809
2019-03-31	47888
2019-06-30	33639
2019-09-30	34816
2019-12-31	50926
2020-03-31	31815
2020-06-30	26193
2020-09-30	25438
2020-12-31	37339
2021-03-31	22102
2021-06-30	20396
2021-09-30	24777
2021-12-31	25809
2022-03-31	20156
2022-06-30	20692
2022-09-30	20629
2022-12-31	28109
2023-03-31	24072
2023-06-30	23979
2023-09-30	23988
2023-12-31	25577