Quarter	US dollars
1999-09-30	8678
1999-12-31	8288
2000-03-31	8442
2000-06-30	8212
2000-09-30	6794
2000-12-31	8954
2001-03-31	10084
2001-06-30	10503
2001-09-30	9356
2001-12-31	9914
2002-03-31	8640
2002-06-30	8512
2002-09-30	8264
2002-12-31	9002
2003-03-31	9338
2003-06-30	11330
2003-09-30	10216
2003-12-31	12779
2004-03-31	11402
2004-06-30	12154
2004-09-30	12814
2004-12-31	14712
2005-03-31	20955
2005-06-30	16181
2005-09-30	21777
2005-12-31	19993
2006-03-31	24143
2006-06-30	23264
2006-09-30	25791
2006-12-31	25384
2007-03-31	32679
2007-06-30	32195
2007-09-30	34681
2007-12-31	29887
2008-03-31	32360
2008-06-30	36618
2008-09-30	31418
2008-12-31	32435
2009-03-31	27947
2009-06-30	30431
2009-09-30	28853
2009-12-31	29677
2010-03-31	30009
2010-06-30	36943
2010-09-30	42784
2010-12-31	45468
2011-03-31	56834
2011-06-30	56196
2011-09-30	54187
2011-12-31	54192
2012-03-31	53190
2012-06-30	60095
2012-09-30	75409
2012-12-31	83957
2013-03-31	82550
2013-06-30	77597
2013-09-30	80032
2013-12-31	79877
2014-03-31	69331
2014-06-30	59498
2014-09-30	66126
2014-12-31	55889
2015-03-31	54677
2015-06-30	54973
2015-09-30	57268
2015-12-31	52227
2016-03-31	47787
2016-06-30	56681
2016-09-30	57932
2016-12-31	50554
2017-03-31	51494
2017-06-30	55152
2017-09-30	45542
2017-12-31	52401
2018-03-31	44991
2018-06-30	40053
2018-09-30	41674
2018-12-31	43057
2019-03-31	45576
2019-06-30	38834
2019-09-30	50247
2019-12-31	54392
2020-03-31	34453
2020-06-30	49018
2020-09-30	61708
2020-12-31	72731
2021-03-31	67141
2021-06-30	62613
2021-09-30	57947
2021-12-31	77633
2022-03-31	53168
2022-06-30	42006
2022-09-30	27647
2022-12-31	32632
2023-03-31	33385
2023-06-30	41487
2023-09-30	41860