Quarter	Millions of US Dollars
1987-10-01	164
1992-10-01	-194
1993-07-01	283
1993-10-01	300
1994-01-01	1000
1994-07-01	612
1995-10-01	385
1996-01-01	400
1996-07-01	1000
1997-04-01	288
1997-10-01	500
1998-07-01	-214
1998-10-01	1000
1999-07-01	-265
2000-07-01	288
2001-04-01	1482
2001-07-01	-700
2002-04-01	-235
2002-10-01	-645
2003-01-01	-300
2003-10-01	1165
2004-01-01	-1000
2004-07-01	-273
2004-10-01	1748
2005-07-01	-270
2006-04-01	-692
2006-07-01	-300
2008-10-01	-1526
2009-10-01	-500
2010-10-01	1202
2011-04-01	-1000
2011-07-01	3104
2012-04-01	6095
2012-07-01	871
2012-10-01	-480
2013-07-01	798
2013-10-01	303
2014-04-01	1712
2014-07-01	-1865
2014-10-01	705
2015-04-01	-2434
2015-10-01	317
2016-04-01	458
2016-07-01	605
2016-10-01	2039
2017-04-01	-1594
2017-10-01	2573