Quarter	Millions of US Dollars
2005-10-01	905
2006-01-01	255
2010-04-01	1020
2011-07-01	72
2013-01-01	-66
2013-04-01	460
2015-10-01	-821
2016-04-01	850
2017-04-01	-826
2018-04-01	-199