Quarter	Millions of US Dollars
2004-01-01	65
2004-04-01	61
2004-07-01	64
2004-10-01	62
2005-01-01	58
2005-04-01	56
2005-07-01	47
2005-10-01	46
2006-01-01	47
2006-04-01	50
2006-07-01	49
2006-10-01	46
2007-01-01	46
2007-04-01	302
2007-07-01	328
2007-10-01	312
2008-01-01	315
2008-04-01	315
2008-07-01	1314
2008-10-01	1289
2009-01-01	1295
2009-04-01	1305
2009-07-01	1330
2009-10-01	1194
2010-01-01	1183
2010-04-01	1097
2010-07-01	1009
2010-10-01	1007
2011-01-01	970
2011-04-01	997
2011-07-01	1140
2011-10-01	1439
2012-01-01	1350
2012-04-01	1411
2012-07-01	1982
2012-10-01	330
2013-01-01	329
2013-04-01	884
2013-07-01	880
2013-10-01	800
2014-01-01	800
2014-04-01	794
2014-07-01	791
2014-10-01	1156
2015-01-01	1114
2015-04-01	1630
2015-07-01	1126
2015-10-01	1424
2016-01-01	1476
2016-04-01	2113
2016-07-01	2680
2016-10-01	386
2017-01-01	280
2017-04-01	281
2017-07-01	0
2017-10-01	0
2018-01-01	0