Quarter	Millions of US Dollars
1978-07-01	25
1983-07-01	-25
1997-10-01	15
1998-04-01	-11
1998-10-01	-4
1999-07-01	150
2000-01-01	50
2001-07-01	354
2002-01-01	140
2002-04-01	500
2002-07-01	300
2002-10-01	452
2003-01-01	348
2003-04-01	0
2004-07-01	286
2005-04-01	375
2006-04-01	400
2006-07-01	75
2007-01-01	-50
2009-10-01	800
2010-04-01	-140
2010-07-01	450
2011-01-01	654
2011-07-01	-654
2012-10-01	800
2013-04-01	14
2013-07-01	0
2014-07-01	800
2015-04-01	-164
2017-01-01	951