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	63
1984-04-01	31
1985-10-01	46
1986-01-01	-15
1987-01-01	67
1987-04-01	-23
1987-10-01	44
1988-04-01	141
1988-07-01	28
1988-10-01	28
1989-01-01	4
1989-04-01	-41
1989-07-01	29
1989-10-01	-16
1990-04-01	-4
1990-10-01	-79
1991-04-01	33
1991-10-01	-66
1992-04-01	-1
1992-10-01	-36
1993-04-01	58
1993-07-01	156
1993-10-01	70
1994-01-01	54
1994-10-01	-39
1995-04-01	86
1995-07-01	86
1995-10-01	-39
1996-01-01	-27
1996-04-01	76
1996-07-01	-227
1997-01-01	-64
1997-04-01	5
1997-10-01	-70
1998-01-01	-6
1998-04-01	-59
1999-04-01	100
1999-10-01	32
2000-01-01	-61
2000-10-01	138
2001-04-01	-86
2001-07-01	139
2002-01-01	172
2002-04-01	26
2002-07-01	-64
2002-10-01	35
2003-01-01	-56
2003-04-01	-65
2003-07-01	153
2003-10-01	3
2004-01-01	96
2004-04-01	0
2004-07-01	-1
2004-10-01	131
2005-01-01	2
2005-04-01	208
2005-07-01	3
2005-10-01	-191
2006-01-01	199
2006-04-01	8
2006-07-01	1
2006-10-01	-92
2007-01-01	2
2007-04-01	207
2007-07-01	3
2007-10-01	-182
2008-01-01	-3
2008-04-01	338
2008-07-01	-192
2009-01-01	-107
2009-04-01	249
2009-07-01	-35
2009-10-01	386
2010-04-01	194
2010-07-01	-9
2011-01-01	-212
2011-04-01	-83
2012-04-01	-853
2012-07-01	259
2013-01-01	328
2013-07-01	-268
2013-10-01	221
2014-01-01	-280
2014-04-01	-337
2015-04-01	208
2015-10-01	103
2016-04-01	-206
2016-10-01	57
2017-04-01	18
2017-10-01	205