Quarter	Millions of US Dollars
2004-10-01	0
2005-01-01	0
2005-04-01	0
2005-07-01	0
2005-10-01	0
2006-01-01	0
2006-04-01	0
2006-07-01	0
2006-10-01	0
2007-01-01	0
2007-04-01	0
2007-07-01	0
2007-10-01	0
2008-01-01	0
2008-04-01	0
2008-07-01	0
2008-10-01	0
2009-01-01	0
2009-04-01	0
2009-07-01	0
2009-10-01	0
2010-01-01	0
2010-04-01	0
2010-07-01	0
2010-10-01	0
2011-01-01	0
2011-04-01	0
2011-07-01	0
2011-10-01	0
2012-01-01	0
2012-04-01	0
2012-07-01	28
2012-10-01	148
2013-01-01	140
2013-04-01	78
2013-07-01	142
2013-10-01	65
2014-01-01	65
2014-04-01	87
2014-07-01	199
2014-10-01	195
2015-01-01	115
2015-04-01	137
2015-07-01	100
2015-10-01	125
2016-01-01	124
2016-04-01	115
2016-07-01	80
2016-10-01	107
2017-01-01	157
2017-04-01	156
2017-07-01	145
2017-10-01	128
2018-01-01	161