Quarter	Millions of US Dollars
2004-01-01	38367
2004-04-01	4305
2004-07-01	4725
2004-10-01	32875
2005-01-01	68910
2005-04-01	69224
2005-07-01	68345
2005-10-01	69876
2006-01-01	73064
2006-04-01	73734
2006-07-01	74777
2006-10-01	78598
2007-01-01	80943
2007-04-01	82040
2007-07-01	84624
2007-10-01	86163
2008-01-01	89677
2008-04-01	89913
2008-07-01	86322
2008-10-01	78116
2009-01-01	72818
2009-04-01	77740
2009-07-01	86236
2009-10-01	92499
2010-01-01	93044
2010-04-01	95870
2010-07-01	105622
2010-10-01	115513
2011-01-01	130175
2011-04-01	135819
2011-07-01	121987
2011-10-01	130130
2012-01-01	142080
2012-04-01	139834
2012-07-01	144881
2012-10-01	153764
2013-01-01	147959
2013-04-01	146863
2013-07-01	159731
2013-10-01	166826
2014-01-01	152162
2014-04-01	160461
2014-07-01	143069
2014-10-01	105044
2015-01-01	127529
2015-04-01	131491
2015-07-01	119100
2015-10-01	110879
2016-01-01	124531
2016-04-01	128260
2016-07-01	131912
2016-10-01	139786
2017-01-01	154182
2017-04-01	152323
2017-07-01	163121
2017-10-01	166592
2018-01-01	167679