Quarter	Millions of US Dollars
2001-10-01	93519
2002-01-01	95889
2002-04-01	106619
2002-07-01	114239
2002-10-01	117467
2003-01-01	124742
2003-04-01	131006
2003-07-01	139023
2003-10-01	152416
2004-01-01	147476
2004-04-01	148193
2004-07-01	156427
2004-10-01	172887
2005-01-01	163776
2005-04-01	144818
2005-07-01	146531
2005-10-01	148409
2006-01-01	146929
2006-04-01	157311
2006-07-01	153452
2006-10-01	167316
2007-01-01	160437
2007-04-01	160369
2007-07-01	157231
2007-10-01	163609
2008-01-01	222417
2008-04-01	210471
2008-07-01	187989
2008-10-01	168828
2009-01-01	171185
2009-04-01	163588
2009-07-01	199175
2009-10-01	186118
2010-01-01	167619
2010-04-01	143536
2010-07-01	420899
2010-10-01	380865
2011-01-01	408043
2011-04-01	406178
2011-07-01	383201
2011-10-01	387371
2012-01-01	396884
2012-04-01	377932
2012-07-01	408169
2012-10-01	406855
2013-01-01	406816
2013-04-01	392113
2013-07-01	416913
2013-10-01	426123
2014-01-01	434880
2014-04-01	410078
2014-07-01	392082
2014-10-01	371434
2015-01-01	346738
2015-04-01	368511
2015-07-01	359980
2015-10-01	366409
2016-01-01	407357
2016-04-01	388462
2016-07-01	373272
2016-10-01	360581
2017-01-01	387661
2017-04-01	400835
2017-07-01	412252
2017-10-01	426501
2018-01-01	407276