Quarter	US dollars
1999-09-30	3336
1999-12-31	3236
2000-03-31	3218
2000-06-30	3157
2000-09-30	3091
2000-12-31	3128
2001-03-31	3064
2001-06-30	3068
2001-09-30	3028
2001-12-31	3083
2002-03-31	3161
2002-06-30	3407
2002-09-30	3298
2002-12-31	3506
2003-03-31	3798
2003-06-30	3993
2003-09-30	4019
2003-12-31	4324
2004-03-31	4486
2004-06-30	4413
2004-09-30	4525
2004-12-31	4767
2005-03-31	5047
2005-06-30	4696
2005-09-30	4530
2005-12-31	4485
2006-03-31	4673
2006-06-30	5125
2006-09-30	5169
2006-12-31	4707
2007-03-31	5056
2007-06-30	5120
2007-09-30	5291
2007-12-31	5521
2008-03-31	5829
2008-06-30	6050
2008-09-30	5448
2008-12-31	5356
2009-03-31	5186
2009-06-30	5673
2009-09-30	5940
2009-12-31	5938
2010-03-31	6046
2010-06-30	5870
2010-09-30	6390
2010-12-31	6412
2011-03-31	7271
2011-06-30	7657
2011-09-30	7078
2011-12-31	7029
2012-03-31	7051
2012-06-30	7090
2012-09-30	7144
2012-12-31	7411
2013-03-31	7493
2013-06-30	8380
2013-09-30	8120
2013-12-31	7924
2014-03-31	8101
2014-06-30	8702
2014-09-30	7156
2014-12-31	7052
2015-03-31	5863
2015-06-30	5559
2015-09-30	5524
2015-12-31	5542
2016-03-31	5540
2016-06-30	5330
2016-09-30	5182
2016-12-31	4777
2017-03-31	5018
2017-06-30	5616
2017-09-30	5346
2017-12-31	5096
2018-03-31	5425
2018-06-30	5577
2018-09-30	5193
2018-12-31	4976
2019-03-31	5331
2019-06-30	5478
2019-09-30	5288
2019-12-31	5631
2020-03-31	5593
2020-06-30	5981
2020-09-30	6436
2020-12-31	6586
2021-03-31	6190
2021-06-30	6002
2021-09-30	6064
2021-12-31	6679
2022-03-31	6746
2022-06-30	6394
2022-09-30	5918
2022-12-31	6422
2023-03-31	6505
2023-06-30	6849
2023-09-30	6382