Quarter	Millions of US Dollars
2005-01-01	72785
2005-04-01	72632
2005-07-01	76044
2005-10-01	80886
2006-01-01	91490
2006-04-01	98159
2006-07-01	104412
2006-10-01	119260
2007-01-01	145381
2007-04-01	156247
2007-07-01	159255
2007-10-01	182494
2008-01-01	180061
2008-04-01	176381
2008-07-01	170370
2008-10-01	163560
2009-01-01	172361
2009-04-01	184913
2009-07-01	197030
2009-10-01	203767
2010-01-01	220106
2010-04-01	226239
2010-07-01	251484
2010-10-01	260162
2011-01-01	266537
2011-04-01	267803
2011-07-01	279959
2011-10-01	274281
2012-01-01	291747
2012-04-01	280373
2012-07-01	281714
2012-10-01	291076
2013-01-01	319158
2013-04-01	292912
2013-07-01	287484
2013-10-01	275626
2014-01-01	284361
2014-04-01	288173
2014-07-01	288456
2014-10-01	287891
2015-01-01	292932
2015-04-01	289418
2015-07-01	270386
2015-10-01	277280
2016-01-01	323584
2016-04-01	319641
2016-07-01	326165
2016-10-01	307456
2017-01-01	331115
2017-04-01	330810
2017-07-01	339375
2017-10-01	352676
2018-01-01	369558