Quarter	Millions of US Dollars
1999-10-01	4875
2000-01-01	4777
2000-04-01	4607
2000-07-01	3807
2000-10-01	4541
2001-01-01	4914
2001-04-01	4868
2001-07-01	6287
2001-10-01	5756
2002-01-01	7053
2002-04-01	7067
2002-07-01	7167
2002-10-01	8854
2003-01-01	10001
2003-04-01	10841
2003-07-01	11354
2003-10-01	11339
2004-01-01	10845
2004-04-01	9693
2004-07-01	10563
2004-10-01	18082
2005-01-01	12149
2005-04-01	11354
2005-07-01	10714
2005-10-01	9495
2006-01-01	7766
2006-04-01	8374
2006-07-01	8839
2006-10-01	6487
2007-01-01	6835
2007-04-01	1899
2007-07-01	5
2007-10-01	487
2008-01-01	1304
2008-04-01	2310
2008-07-01	2667
2008-10-01	6
2009-01-01	6
2009-04-01	7
2009-07-01	6
2009-10-01	6
2010-01-01	1126
2010-04-01	3212
2010-07-01	4017
2010-10-01	5038
2011-01-01	5034
2011-04-01	6715
2011-07-01	9624
2011-10-01	8739
2012-01-01	6149
2012-04-01	8512
2012-07-01	8883
2012-10-01	9016
2013-01-01	5657
2013-04-01	4466
2013-07-01	6328
2013-10-01	6954
2014-01-01	5908
2014-04-01	2832
2014-07-01	3588
2014-10-01	4860
2015-01-01	2305
2015-04-01	631
2015-07-01	2121
2015-10-01	4431
2016-01-01	3568
2016-04-01	5084
2016-07-01	4674
2016-10-01	4387
2017-01-01	3118
2017-04-01	2877
2017-07-01	3028
2017-10-01	5777
2018-01-01	4667