Quarter	Millions of US Dollars
1983-07-01	38
1984-01-01	100
1985-04-01	196
1987-04-01	85
1988-07-01	-54
1988-10-01	83
1990-04-01	-46
1992-04-01	-93
1993-07-01	71
1993-10-01	-67
1994-01-01	20
1994-04-01	-156
1994-07-01	-143
1994-10-01	-23
1995-01-01	-15
1995-04-01	-9
1995-07-01	60
1995-10-01	-10
1996-01-01	0
1996-04-01	5
1996-07-01	50
1996-10-01	0
1997-01-01	20
1997-04-01	-5
1997-07-01	205
1997-10-01	-5
1998-01-01	-5
1998-04-01	5
1998-07-01	-75
1998-10-01	0
1999-01-01	-2
1999-04-01	10
2000-01-01	0
2000-04-01	5
2000-07-01	-5
2001-01-01	0
2001-04-01	-5
2001-07-01	-50
2001-10-01	20
2002-01-01	-15
2002-04-01	320
2002-07-01	-215
2002-10-01	-5
2003-01-01	500
2003-04-01	260
2003-07-01	10
2004-01-01	10
2004-04-01	240
2004-07-01	-20
2004-10-01	14
2005-01-01	20
2005-04-01	-20
2005-07-01	420
2005-10-01	486
2006-01-01	500
2006-04-01	0
2006-07-01	310
2006-10-01	80
2007-04-01	2095
2007-07-01	-10
2007-10-01	-27
2008-01-01	-125
2008-04-01	-282
2008-07-01	-55
2009-04-01	500
2009-07-01	-27
2009-10-01	533
2010-01-01	1238
2010-04-01	229
2010-10-01	128
2011-01-01	-700
2011-04-01	-13
2011-07-01	-300
2011-10-01	1180
2012-01-01	-420
2012-04-01	-660
2012-07-01	1500
2012-10-01	606
2013-01-01	3
2013-04-01	699
2013-07-01	1500
2013-10-01	582
2014-01-01	48
2014-04-01	-472
2014-07-01	1440
2014-10-01	-251
2015-01-01	324
2015-04-01	-806
2015-07-01	-48
2015-10-01	997
2016-01-01	658
2016-07-01	-58
2016-10-01	1360
2017-01-01	1700
2017-04-01	-246
2017-07-01	6500
2017-10-01	330
2018-01-01	-524
2018-04-01	1832