Quarter	Millions of US Dollars
1999-07-01	150
2000-01-01	50
2001-07-01	354
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
2011-01-01	654
2011-07-01	-654
2012-10-01	800
2014-07-01	800
2017-01-01	601