Quarter	US dollars
1999-09-30	3618
1999-12-31	2944
2000-03-31	2776
2000-06-30	3516
2000-09-30	3634
2000-12-31	5068
2001-03-31	4112
2001-06-30	4466
2001-09-30	6069
2001-12-31	5617
2002-03-31	6125
2002-06-30	7019
2002-09-30	7391
2002-12-31	7628
2003-03-31	8579
2003-06-30	11771
2003-09-30	11437
2003-12-31	10025
2004-03-31	10665
2004-06-30	11568
2004-09-30	13395
2004-12-31	10922
2005-03-31	17520
2005-06-30	12279
2005-09-30	22046
2005-12-31	13014
2006-03-31	13848
2006-06-30	17355
2006-09-30	21464
2006-12-31	23803
2007-03-31	22810
2007-06-30	25810
2007-09-30	29917
2007-12-31	23329
2008-03-31	20688
2008-06-30	17403
2008-09-30	19680
2008-12-31	15479
2009-03-31	13157
2009-06-30	9271
2009-09-30	9709
2009-12-31	7817
2010-03-31	12208
2010-06-30	12287
2010-09-30	10323
2010-12-31	14401
2011-03-31	18467
2011-06-30	13058
2011-09-30	15437
2011-12-31	9842
2012-03-31	9955
2012-06-30	9424
2012-09-30	10379
2012-12-31	10231
2013-03-31	10467
2013-06-30	9084
2013-09-30	8894
2013-12-31	10788
2014-03-31	12953
2014-06-30	10214
2014-09-30	8980
2014-12-31	8989
2015-03-31	9698
2015-06-30	9982
2015-09-30	10509
2015-12-31	8602
2016-03-31	9666
2016-06-30	10444
2016-09-30	8998
2016-12-31	8371
2017-03-31	10781
2017-06-30	8850
2017-09-30	10354
2017-12-31	11517
2018-03-31	10661
2018-06-30	9111
2018-09-30	9420
2018-12-31	10606
2019-03-31	9139
2019-06-30	8397
2019-09-30	8933
2019-12-31	9103
2020-03-31	8388
2020-06-30	8061
2020-09-30	9639
2020-12-31	10809
2021-03-31	9007
2021-06-30	9871
2021-09-30	9410
2021-12-31	8402
2022-03-31	6992
2022-06-30	7913
2022-09-30	9170
2022-12-31	8162
2023-03-31	8136
2023-06-30	6583
2023-09-30	7194