Quarter	Millions of US Dollars
1976-04-01	24
1976-07-01	25
1977-10-01	10
1978-10-01	26
1981-04-01	-25
1983-10-01	60
1985-04-01	20
1985-10-01	-24
1987-10-01	-10
1988-07-01	-27
1988-10-01	196
1990-10-01	-60
1994-01-01	278
1994-10-01	-171
1995-01-01	252
1995-04-01	84
1995-07-01	144
1996-07-01	137
1997-07-01	486
1999-07-01	114
2000-01-01	-234
2000-04-01	-112
2000-07-01	463
2000-10-01	-46
2001-01-01	462
2002-04-01	650
2003-01-01	357
2004-01-01	-280
2004-04-01	542
2004-10-01	-25
2005-04-01	629
2005-07-01	-135
2006-01-01	-299
2006-04-01	-91
2007-07-01	2
2008-10-01	-36
2009-07-01	-156
2010-07-01	-408
2011-04-01	-647
2011-07-01	-193
2012-04-01	-150
2012-07-01	485
2012-10-01	303
2013-01-01	-436
2013-07-01	228
2014-07-01	500
2014-10-01	459
2015-01-01	1000
2016-07-01	500
2017-01-01	989
2017-04-01	500
2017-07-01	-98
2017-10-01	8