Quarter	Millions of US Dollars
1999-10-01	10682
2000-01-01	8049
2000-04-01	8653
2000-07-01	7767
2000-10-01	8220
2001-01-01	7684
2001-04-01	6707
2001-07-01	6347
2001-10-01	6860
2002-01-01	6654
2002-04-01	7383
2002-07-01	8009
2002-10-01	8942
2003-01-01	8566
2003-04-01	9062
2003-07-01	8732
2003-10-01	8655
2004-01-01	8736
2004-04-01	8398
2004-07-01	8974
2004-10-01	10613
2005-01-01	11935
2005-04-01	10963
2005-07-01	11046
2005-10-01	11716
2006-01-01	12135
2006-04-01	12084
2006-07-01	10866
2006-10-01	10324
2007-01-01	9574
2007-04-01	8778
2007-07-01	8547
2007-10-01	8040
2008-01-01	10914
2008-04-01	9404
2008-07-01	9126
2008-10-01	10102
2009-01-01	10447
2009-04-01	10261
2009-07-01	10512
2009-10-01	6749
2010-01-01	8521
2010-04-01	9594
2010-07-01	9169
2010-10-01	9803
2011-01-01	10081
2011-04-01	10845
2011-07-01	11166
2011-10-01	11284
2012-01-01	16988
2012-04-01	14821
2012-07-01	11939
2012-10-01	14209
2013-01-01	15529
2013-04-01	13621
2013-07-01	13780
2013-10-01	13894
2014-01-01	13358
2014-04-01	13709
2014-07-01	11115
2014-10-01	10511
2015-01-01	11091
2015-04-01	8549
2015-07-01	6317
2015-10-01	7011
2016-01-01	11390
2016-04-01	7160
2016-07-01	7056
2016-10-01	6840
2017-01-01	8316
2017-04-01	8301
2017-07-01	7484
2017-10-01	7334
2018-01-01	7645