Quarter	Millions of US Dollars
2005-01-01	43522
2005-04-01	46359
2005-07-01	48195
2005-10-01	48238
2006-01-01	50715
2006-04-01	53050
2006-07-01	53888
2006-10-01	56611
2007-01-01	60306
2007-04-01	63350
2007-07-01	67797
2007-10-01	68121
2008-01-01	73692
2008-04-01	75315
2008-07-01	72024
2008-10-01	75841
2009-01-01	73968
2009-04-01	82236
2009-07-01	89002
2009-10-01	91768
2010-01-01	101070
2010-04-01	102762
2010-07-01	110638
2010-10-01	113655
2011-01-01	124149
2011-04-01	125978
2011-07-01	119338
2011-10-01	124804
2012-01-01	134324
2012-04-01	132599
2012-07-01	140729
2012-10-01	146540
2013-01-01	147300
2013-04-01	148254
2013-07-01	146990
2013-10-01	150875
2014-01-01	159017
2014-04-01	164197
2014-07-01	161069
2014-10-01	155559
2015-01-01	150943
2015-04-01	156192
2015-07-01	132310
2015-10-01	137172
2016-01-01	157935
2016-04-01	159054
2016-07-01	151669
2016-10-01	140687
2017-01-01	146960
2017-04-01	156564
2017-07-01	160207
2017-10-01	167179
2018-01-01	179447