Quarter	Millions of US Dollars
2002-04-01	236614
2002-07-01	226728
2002-10-01	232692
2003-01-01	215234
2003-04-01	223553
2003-07-01	215698
2003-10-01	210319
2004-01-01	209550
2004-04-01	204267
2004-07-01	198293
2004-10-01	218368
2005-01-01	217916
2005-04-01	219563
2005-07-01	217255
2005-10-01	216116
2006-01-01	213611
2006-04-01	216519
2006-07-01	213924
2006-10-01	217853
2007-01-01	219077
2007-04-01	223643
2007-07-01	224142
2007-10-01	218123
2008-01-01	218360
2008-04-01	207358
2008-07-01	183224
2008-10-01	178602
2009-01-01	196587
2009-04-01	232574
2009-07-01	268042
2009-10-01	283981
2010-01-01	305949
2010-04-01	300314
2010-07-01	338362
2010-10-01	352825
2011-01-01	375273
2011-04-01	396915
2011-07-01	369496
2011-10-01	388550
2012-01-01	411320
2012-04-01	420726
2012-07-01	455186
2012-10-01	487969
2013-01-01	481052
2013-04-01	479797
2013-07-01	516188
2013-10-01	538690
2014-01-01	529914
2014-04-01	560868
2014-07-01	540008
2014-10-01	492068
2015-01-01	484142
2015-04-01	506053
2015-07-01	479792
2015-10-01	479369
2016-01-01	495416
2016-04-01	491397
2016-07-01	514475
2016-10-01	469301
2017-01-01	507185
2017-04-01	505372
2017-07-01	503596
2017-10-01	539633
2018-01-01	542402