Quarter	US dollars
1999-09-30	5597
1999-12-31	5971
2000-03-31	6054
2000-06-30	6049
2000-09-30	6298
2000-12-31	5406
2001-03-31	6281
2001-06-30	6995
2001-09-30	7187
2001-12-31	6298
2002-03-31	5167
2002-06-30	5807
2002-09-30	6482
2002-12-31	6107
2003-03-31	7351
2003-06-30	8809
2003-09-30	7709
2003-12-31	6842
2004-03-31	9631
2004-06-30	7150
2004-09-30	7773
2004-12-31	9306
2005-03-31	11949
2005-06-30	10067
2005-09-30	12229
2005-12-31	9107
2006-03-31	12473
2006-06-30	9994
2006-09-30	10925
2006-12-31	11899
2007-03-31	16183
2007-06-30	13631
2007-09-30	12825
2007-12-31	10739
2008-03-31	13654
2008-06-30	14488
2008-09-30	11929
2008-12-31	12184
2009-03-31	7882
2009-06-30	7590
2009-09-30	7043
2009-12-31	5600
2010-03-31	7524
2010-06-30	9164
2010-09-30	12421
2010-12-31	6719
2011-03-31	7981
2011-06-30	7514
2011-09-30	9266
2011-12-31	6605
2012-03-31	7482
2012-06-30	8759
2012-09-30	8302
2012-12-31	8268
2013-03-31	7782
2013-06-30	8624
2013-09-30	8401
2013-12-31	7745
2014-03-31	7855
2014-06-30	9448
2014-09-30	7359
2014-12-31	7020
2015-03-31	5881
2015-06-30	6399
2015-09-30	5527
2015-12-31	6513
2016-03-31	6332
2016-06-30	6365
2016-09-30	6732
2016-12-31	5043
2017-03-31	6447
2017-06-30	6516
2017-09-30	7439
2017-12-31	5844
2018-03-31	8773
2018-06-30	6998
2018-09-30	5000
2018-12-31	4241
2019-03-31	4829
2019-06-30	6195
2019-09-30	5869
2019-12-31	4910
2020-03-31	5860
2020-06-30	5930
2020-09-30	5226
2020-12-31	5236
2021-03-31	6790
2021-06-30	6811
2021-09-30	6754
2021-12-31	5081
2022-03-31	6498
2022-06-30	7144
2022-09-30	6228
2022-12-31	5272
2023-03-31	6324
2023-06-30	5403
2023-09-30	6389