Quarter	Millions of US Dollars
1996-04-01	220
1996-07-01	325
1996-10-01	-135
1997-04-01	233
1997-10-01	-4
1998-04-01	552
1998-10-01	-4
1999-01-01	439
1999-04-01	-4
1999-10-01	-4
2000-01-01	385
2000-04-01	-4
2000-10-01	-4
2001-01-01	92
2001-04-01	394
2001-07-01	-325
2001-10-01	-4
2002-04-01	-4
2002-10-01	-4
2003-04-01	-4
2003-10-01	-4
2004-04-01	-250
2004-10-01	-4
2005-04-01	-633
2005-10-01	-4
2006-04-01	-4
2006-10-01	-8
2007-01-01	1315
2008-01-01	1471
2009-01-01	-521
2010-01-01	-691
2011-04-01	-647
2012-10-01	2250
2013-04-01	3500
2014-01-01	3500
2014-04-01	2753
2016-01-01	137
2017-10-01	-1177
2018-01-01	-1229
2018-04-01	-1000