Quarter	US dollars
1999-09-30	1064
1999-12-31	927
2000-03-31	747
2000-06-30	689
2000-09-30	1183
2000-12-31	1307
2001-03-31	1240
2001-06-30	1191
2001-09-30	1341
2001-12-31	1521
2002-03-31	1616
2002-06-30	1640
2002-09-30	1513
2002-12-31	1671
2003-03-31	1617
2003-06-30	1734
2003-09-30	1743
2003-12-31	1830
2004-03-31	1842
2004-06-30	1928
2004-09-30	1844
2004-12-31	1751
2005-03-31	1875
2005-06-30	1934
2005-09-30	2001
2005-12-31	1978
2006-03-31	2224
2006-06-30	2151
2006-09-30	2552
2006-12-31	4638
2007-03-31	4831
2007-06-30	5018
2007-09-30	4574
2007-12-31	4820
2008-03-31	5428
2008-06-30	4448
2008-09-30	4596
2008-12-31	4078
2009-03-31	4286
2009-06-30	4525
2009-09-30	4673
2009-12-31	4744
2010-03-31	5005
2010-06-30	6176
2010-09-30	5535
2010-12-31	5698
2011-03-31	6290
2011-06-30	6474
2011-09-30	6811
2011-12-31	5990
2012-03-31	6023
2012-06-30	5689
2012-09-30	5938
2012-12-31	5711
2013-03-31	5740
2013-06-30	5786
2013-09-30	6087
2013-12-31	5509
2014-03-31	5862
2014-06-30	5917
2014-09-30	5747
2014-12-31	5458
2015-03-31	5960
2015-06-30	5343
2015-09-30	5211
2015-12-31	4812
2016-03-31	4857
2016-06-30	4877
2016-09-30	4964
2016-12-31	5068
2017-03-31	5344
2017-06-30	6944
2017-09-30	7011
2017-12-31	6751
2018-03-31	6709
2018-06-30	6859
2018-09-30	6462
2018-12-31	5668
2019-03-31	5815
2019-06-30	5473
2019-09-30	5193
2019-12-31	5807
2020-03-31	5667
2020-06-30	5524
2020-09-30	5361
2020-12-31	5027
2021-03-31	6147
2021-06-30	6666
2021-09-30	6704
2021-12-31	7040
2022-03-31	6917
2022-06-30	6109
2022-09-30	5094
2022-12-31	4558
2023-03-31	3583
2023-06-30	3534
2023-09-30	3569