Quarter	Millions of US Dollars
2001-10-01	15019
2002-01-01	4957
2002-04-01	14576
2002-07-01	14687
2002-10-01	15553
2003-01-01	14821
2003-04-01	15174
2003-07-01	15142
2003-10-01	15085
2004-01-01	14683
2004-04-01	14675
2004-07-01	14507
2004-10-01	13916
2005-01-01	13350
2005-04-01	13413
2005-07-01	12438
2005-10-01	11524
2006-01-01	11641
2006-04-01	11314
2006-07-01	10656
2006-10-01	10504
2007-01-01	10183
2007-04-01	10882
2007-07-01	9892
2007-10-01	9398
2008-01-01	9411
2008-04-01	8654
2008-07-01	8587
2008-10-01	8174
2009-01-01	7664
2009-04-01	7290
2009-07-01	7316
2009-10-01	6791
2010-01-01	6739
2010-04-01	7048
2010-07-01	6931
2010-10-01	6874
2011-01-01	7240
2011-04-01	7116
2011-07-01	6992
2011-10-01	6846
2012-01-01	6718
2012-04-01	6788
2012-07-01	6121
2012-10-01	6039
2013-01-01	5974
2013-04-01	5921
2013-07-01	5812
2013-10-01	6206
2014-01-01	5974
2014-04-01	6681
2014-07-01	6636
2014-10-01	6647
2015-01-01	7012
2015-04-01	8475
2015-07-01	8459
2015-10-01	8480
2016-01-01	9354
2016-04-01	9327
2016-07-01	11177
2016-10-01	11219
2017-01-01	12798
2017-04-01	13314
2017-07-01	13686