Quarter	Millions of US Dollars
2001-10-01	131
2002-10-01	336
2003-10-01	363
2004-10-01	370
2005-10-01	336
2006-10-01	791
2007-01-01	854
2007-04-01	936
2007-07-01	959
2007-10-01	1217
2008-01-01	1411
2008-04-01	1283
2008-07-01	1248
2008-10-01	1190
2009-01-01	1089
2009-04-01	1152
2009-07-01	1171
2009-10-01	1158
2010-01-01	1060
2010-04-01	974
2010-07-01	1070
2010-10-01	816
2011-01-01	817
2011-04-01	778
2011-07-01	769
2011-10-01	768
2012-01-01	789
2012-04-01	759
2012-07-01	744
2012-10-01	738
2013-01-01	707
2013-04-01	734
2013-07-01	760
2013-10-01	664
2014-01-01	646
2014-04-01	598
2014-07-01	541
2014-10-01	550
2015-01-01	486
2015-04-01	441
2015-07-01	494
2015-10-01	511
2016-01-01	543
2016-04-01	547
2016-07-01	792
2016-10-01	750
2017-01-01	776
2017-04-01	814
2017-07-01	887
2017-10-01	895
2018-01-01	933