Quarter	Millions of US Dollars
1994-01-01	205
1998-04-01	250
1999-01-01	-10
1999-07-01	-10
2000-01-01	-10
2000-07-01	-10
2001-01-01	-10
2001-07-01	-10
2002-01-01	-10
2002-07-01	-10
2003-01-01	-10
2003-07-01	-20
2004-07-01	-10
2005-01-01	-10
2005-07-01	-10
2006-01-01	-10
2006-10-01	-10
2007-04-01	-10
2007-07-01	-10
2008-01-01	987
2008-04-01	1396
2008-07-01	-1227
2008-10-01	-987
2009-01-01	175
2009-04-01	-91
2009-07-01	817
2009-10-01	-461
2010-01-01	623
2010-04-01	-431
2010-07-01	38
2010-10-01	40
2011-01-01	227
2011-04-01	-443
2011-07-01	-56
2011-10-01	639
2012-01-01	-652
2012-04-01	-384
2012-10-01	130
2013-01-01	-132
2013-04-01	392
2013-07-01	199
2013-10-01	-204
2014-01-01	170
2014-04-01	-211
2014-07-01	26
2014-10-01	0
2015-01-01	112
2015-04-01	0
2015-07-01	538
2015-10-01	-90
2016-01-01	90
2016-04-01	0
2016-07-01	56
2016-10-01	0
2017-01-01	-328
2017-04-01	56
2018-01-01	137