Quarter	Millions of US Dollars
1966-01-01	15
1972-01-01	50
1972-04-01	15
1974-07-01	34
1974-10-01	84
1975-01-01	31
1975-04-01	44
1975-07-01	286
1975-10-01	33
1976-04-01	150
1976-07-01	71
1976-10-01	141
1977-01-01	30
1977-04-01	206
1977-07-01	142
1977-10-01	110
1978-01-01	278
1978-04-01	34
1978-10-01	280
1979-01-01	96
1979-04-01	152
1979-07-01	111
1979-10-01	0
1980-04-01	94
1980-07-01	-12
1981-01-01	97
1981-04-01	114
1981-07-01	-6
1981-10-01	99
1982-01-01	405
1982-04-01	222
1982-07-01	32
1982-10-01	141
1983-01-01	222
1983-04-01	-106
1983-07-01	-38
1984-01-01	89
1984-04-01	119
1984-07-01	86
1984-10-01	513
1985-04-01	123
1985-07-01	483
1985-10-01	31
1986-01-01	350
1986-04-01	396
1986-07-01	1081
1986-10-01	749
1987-01-01	343
1987-04-01	215
1987-07-01	-309
1987-10-01	-207
1988-01-01	-291
1988-04-01	876
1988-07-01	-112
1988-10-01	45
1989-01-01	-510
1989-04-01	-23
1989-07-01	-152
1989-10-01	325
1990-01-01	-202
1990-04-01	285
1990-07-01	-36
1990-10-01	-115
1991-01-01	-60
1991-07-01	-200
1991-10-01	-712
1992-01-01	-12
1992-04-01	-895
1992-07-01	-209
1992-10-01	-250
1993-01-01	-685
1993-04-01	-446
1993-07-01	313
1993-10-01	-52
1994-01-01	175
1994-04-01	-244
1994-07-01	-317
1994-10-01	-47
1995-01-01	-344
1995-04-01	-863
1995-07-01	-175
1995-10-01	-429
1996-01-01	-463
1996-04-01	-32
1996-07-01	-315
1996-10-01	-434
1997-01-01	-996
1997-04-01	-132
1997-07-01	69
1997-10-01	344
1998-01-01	-235
1998-04-01	11
1998-07-01	-214
1998-10-01	99
1999-01-01	-317
1999-04-01	-10
1999-07-01	2
1999-10-01	-180
2000-01-01	110
2000-04-01	-129
2000-07-01	-192
2000-10-01	30
2001-01-01	-444
2001-04-01	26
2001-07-01	29
2001-10-01	-43
2002-01-01	-89
2002-04-01	40
2002-07-01	-61
2002-10-01	43
2003-01-01	-64
2003-04-01	410
2003-07-01	-66
2003-10-01	136
2004-01-01	-425
2004-04-01	50
2004-07-01	74
2004-10-01	-44
2005-01-01	-394
2005-04-01	-124
2005-07-01	-200
2005-10-01	-110
2006-01-01	-166
2006-10-01	-275
2007-01-01	-25
2008-01-01	-169
2008-04-01	-414
2008-07-01	100
2008-10-01	-100
2009-01-01	100
2009-04-01	0
2009-07-01	-100
2011-01-01	-100
2011-04-01	100
2012-01-01	55
2012-04-01	-269
2012-07-01	-57
2012-10-01	793
2013-01-01	1047
2013-04-01	-1680
2013-07-01	215
2014-01-01	455
2014-07-01	-8
2015-04-01	300
2015-07-01	71
2015-10-01	-282
2016-04-01	-156
2016-07-01	24
2016-10-01	119
2017-01-01	532
2017-04-01	60
2017-07-01	92
2017-10-01	589