Quarter	Millions of US Dollars
1974-10-01	10
1975-10-01	19
1978-04-01	13
1979-10-01	22
1981-01-01	16
1982-04-01	16
1983-01-01	34
1984-04-01	31
1986-01-01	-15
1987-04-01	-23
1988-04-01	69
1988-07-01	28
1988-10-01	28
1989-01-01	-44
1989-04-01	-41
1989-10-01	-16
1990-04-01	-4
1990-10-01	-39
1991-04-01	-1
1991-10-01	-24
1992-04-01	-1
1993-04-01	-8
1993-07-01	66
1995-10-01	-39
1996-07-01	-119
1997-01-01	6
1997-04-01	5
1997-10-01	-70
1998-01-01	-6
1998-04-01	-5
2002-01-01	37
2002-04-01	26
2002-07-01	3
2002-10-01	35
2003-01-01	17
2003-04-01	10
2003-07-01	2
2003-10-01	3
2004-01-01	7
2004-04-01	0
2004-07-01	-1
2004-10-01	5
2005-01-01	2
2005-04-01	-1
2005-07-01	3
2005-10-01	1
2006-01-01	2
2006-04-01	206
2006-07-01	1
2006-10-01	3
2007-01-01	2
2007-04-01	207
2007-07-01	3
2007-10-01	-51
2008-01-01	-3
2008-04-01	338
2008-07-01	-5
2009-01-01	48
2009-04-01	249
2009-07-01	-35
2009-10-01	0
2010-01-01	-166
2010-04-01	185
2010-07-01	-9
2011-04-01	-310
2012-04-01	-586
2012-07-01	259
2013-01-01	328
2013-10-01	221
2014-04-01	-337
2015-04-01	208
2015-10-01	305
2016-04-01	-206
2016-10-01	357
2017-04-01	273
2017-10-01	205