Quarter	Millions of US Dollars
1996-10-01	200
1997-10-01	350
1999-10-01	100
2000-04-01	350
2001-07-01	150
2002-10-01	-250
2003-04-01	100
2004-01-01	200
2004-04-01	300
2004-10-01	100
2005-01-01	200
2005-04-01	600
2005-10-01	450
2006-01-01	421
2006-04-01	550
2006-07-01	687
2006-10-01	270
2007-04-01	-400
2007-10-01	650
2008-01-01	-246
2008-04-01	-260
2008-10-01	-150
2009-01-01	-325
2009-07-01	500
2009-10-01	100
2010-04-01	561
2010-10-01	3800
2011-01-01	1054
2011-04-01	254
2011-07-01	-706
2011-10-01	-42
2012-01-01	47
2012-04-01	36
2012-07-01	876
2012-10-01	1800
2013-01-01	985
2013-04-01	3770
2013-07-01	500
2013-10-01	500
2014-04-01	1908
2014-07-01	-882
2014-10-01	6815
2015-01-01	-565
2015-04-01	-859
2015-07-01	4752
2015-10-01	-1371
2016-01-01	4053
2016-04-01	-4211
2016-07-01	-1649
2016-10-01	-944
2017-01-01	133
2017-04-01	2164
2017-07-01	597
2017-10-01	-79
2018-01-01	-37
2018-04-01	1654