Quarter	Millions of US Dollars
1977-04-01	10
1982-04-01	-10
1984-10-01	200
1987-10-01	-200
2004-10-01	187
2005-01-01	600
2005-10-01	700
2006-04-01	1409
2006-07-01	467
2006-10-01	500
2008-04-01	1330
2008-07-01	-47
2009-01-01	82
2009-07-01	1867
2009-10-01	200
2010-01-01	243
2010-10-01	-100
2011-04-01	-1468
2011-10-01	1000
2012-04-01	1750
2013-01-01	-1330
2013-04-01	2000
2013-10-01	-100
2014-04-01	634
2015-01-01	-843
2015-10-01	-1100
2016-04-01	800
2016-07-01	833
2016-10-01	30561
2017-01-01	494
2017-04-01	9556
2017-07-01	203
2017-10-01	13954
2018-01-01	956
2018-04-01	11544