Quarter	US dollars
1999-09-30	1179
1999-12-31	1269
2000-03-31	1164
2000-06-30	1408
2000-09-30	1437
2000-12-31	1574
2001-03-31	1733
2001-06-30	1723
2001-09-30	1959
2001-12-31	1828
2002-03-31	1488
2002-06-30	2821
2002-09-30	2939
2002-12-31	3607
2003-03-31	4133
2003-06-30	5520
2003-09-30	5288
2003-12-31	5547
2004-03-31	6096
2004-06-30	5009
2004-09-30	5861
2004-12-31	7968
2005-03-31	7278
2005-06-30	9416
2005-09-30	9111
2005-12-31	7249
2006-03-31	6081
2006-06-30	6613
2006-09-30	5123
2006-12-31	4855
2007-03-31	8561
2007-06-30	10215
2007-09-30	11452
2007-12-31	13697
2008-03-31	17414
2008-06-30	21047
2008-09-30	15052
2008-12-31	28475
2009-03-31	24560
2009-06-30	20545
2009-09-30	22382
2009-12-31	18686
2010-03-31	19949
2010-06-30	21960
2010-09-30	26043
2010-12-31	21059
2011-03-31	17308
2011-06-30	18061
2011-09-30	23636
2011-12-31	22721
2012-03-31	23278
2012-06-30	25302
2012-09-30	25094
2012-12-31	23804
2013-03-31	22091
2013-06-30	19734
2013-09-30	19127
2013-12-31	18202
2014-03-31	14722
2014-06-30	19292
2014-09-30	19809
2014-12-31	20244
2015-03-31	19864
2015-06-30	13904
2015-09-30	13803
2015-12-31	11110
2016-03-31	13291
2016-06-30	13651
2016-09-30	13747
2016-12-31	10892
2017-03-31	8552
2017-06-30	8524
2017-09-30	8433
2017-12-31	8534
2018-03-31	8556
2018-06-30	6046
2018-09-30	6982
2018-12-31	8044
2019-03-31	8867
2019-06-30	10045
2019-09-30	13280
2019-12-31	10860
2020-03-31	12470
2020-06-30	12693
2020-09-30	12920
2020-12-31	12737
2021-03-31	9613
2021-06-30	9029
2021-09-30	8302
2021-12-31	7790
2022-03-31	5956
2022-06-30	5901
2022-09-30	6186
2022-12-31	5842
2023-03-31	5580
2023-06-30	5536
2023-09-30	5271