Quarter	Millions of US Dollars
1999-04-01	1000
2000-04-01	1400
2009-04-01	2000
2009-10-01	7000
2010-04-01	550
2011-10-01	5000
2012-01-01	-1000
2012-07-01	4000
2014-04-01	-2000
2015-01-01	-3500
2015-04-01	-549
2016-04-01	9000
2017-01-01	-2000
2018-01-01	-2000
2018-04-01	12000