Quarter	Millions of US Dollars
1995-10-01	60
1996-07-01	50
1997-07-01	200
1997-10-01	-110
1999-01-01	218
1999-07-01	52
1999-10-01	261
2000-01-01	245
2000-04-01	20
2000-07-01	106
2000-10-01	25
2001-01-01	185
2001-07-01	-20
2002-04-01	356
2002-07-01	-200
2003-01-01	432
2003-04-01	-284
2003-07-01	-45
2004-01-01	442
2004-04-01	0
2005-01-01	355
2005-10-01	54
2006-01-01	396
2006-10-01	756
2007-10-01	851
2008-01-01	-299
2008-10-01	105
2009-01-01	188
2009-04-01	700
2009-10-01	1500
2010-01-01	2000
2010-07-01	750
2011-01-01	750
2011-10-01	750
2012-01-01	1500
2012-04-01	-759
2012-10-01	189
2013-01-01	-782
2014-01-01	685
2014-04-01	-685
2014-10-01	1250
2015-01-01	-1500
2015-10-01	1487
2016-01-01	-1102
2016-07-01	502
2017-04-01	1432
2017-07-01	-399
2017-10-01	1286
2018-01-01	-1721
2018-04-01	-178