Quarter	Millions of US Dollars
1966-04-01	10
1971-01-01	15
1971-10-01	12
1972-01-01	13
1972-04-01	24
1973-01-01	12
1973-04-01	21
1974-04-01	3
1974-10-01	11
1975-04-01	78
1976-01-01	23
1976-04-01	32
1976-07-01	45
1976-10-01	35
1977-01-01	32
1977-07-01	56
1977-10-01	32
1978-01-01	84
1978-04-01	34
1978-07-01	15
1978-10-01	65
1979-01-01	17
1979-10-01	-9
1980-01-01	59
1980-07-01	52
1980-10-01	61
1981-01-01	-18
1981-04-01	29
1981-07-01	24
1981-10-01	33
1982-01-01	10
1982-04-01	-17
1982-07-01	-15
1982-10-01	60
1983-01-01	16
1983-04-01	39
1983-10-01	-12
1984-01-01	80
1984-04-01	2
1984-07-01	-11
1984-10-01	45
1985-01-01	24
1985-04-01	-69
1985-07-01	30
1985-10-01	47
1986-01-01	-10
1986-04-01	2
1986-07-01	56
1986-10-01	-21
1987-01-01	-24
1987-04-01	296
1987-07-01	-32
1987-10-01	86
1988-01-01	122
1988-04-01	122
1988-07-01	53
1988-10-01	144
1989-01-01	-10
1989-04-01	77
1989-07-01	80
1989-10-01	105
1990-01-01	219
1990-04-01	103
1990-07-01	152
1990-10-01	280
1991-01-01	89
1991-04-01	-148
1991-07-01	58
1991-10-01	-111
1992-01-01	-38
1992-04-01	81
1992-07-01	-98
1992-10-01	-175
1993-01-01	236
1993-04-01	-179
1993-07-01	-123
1993-10-01	-221
1994-01-01	356
1994-04-01	209
1994-07-01	119
1994-10-01	-140
1995-01-01	46
1995-04-01	7
1995-07-01	156
1995-10-01	230
1996-01-01	-32
1996-04-01	70
1996-07-01	558
1996-10-01	262
1997-01-01	-31
1997-04-01	-299
1997-07-01	-81
1997-10-01	-47
1998-01-01	-306
1998-04-01	119
1998-07-01	941
1998-10-01	-224
1999-01-01	39
1999-04-01	92
1999-07-01	6
1999-10-01	373
2000-01-01	271
2000-04-01	288
2000-07-01	17
2000-10-01	323
2001-01-01	577
2001-04-01	1201
2001-07-01	-64
2001-10-01	47
2002-01-01	57
2002-04-01	-257
2002-07-01	-88
2002-10-01	-17
2003-01-01	1493
2003-04-01	28
2003-07-01	866
2003-10-01	-148
2004-01-01	668
2004-04-01	916
2004-07-01	95
2004-10-01	1413
2005-01-01	502
2005-04-01	1899
2005-07-01	-40
2005-10-01	386
2006-01-01	-288
2006-04-01	-389
2006-07-01	-569
2006-10-01	-660
2007-01-01	-612
2007-04-01	9
2007-07-01	-156
2007-10-01	-112
2008-01-01	48
2008-04-01	167
2008-07-01	-540
2008-10-01	-278
2009-01-01	-456
2009-04-01	1128
2009-07-01	-22
2009-10-01	972
2010-01-01	789
2010-04-01	450
2010-07-01	-1537
2010-10-01	-331
2011-01-01	3017
2011-04-01	287
2011-07-01	-101
2011-10-01	-956
2012-01-01	969
2012-04-01	-1509
2012-07-01	2115
2012-10-01	1951
2013-01-01	-905
2013-04-01	2103
2013-07-01	455
2013-10-01	-872
2014-01-01	-633
2014-04-01	350
2014-07-01	1075
2014-10-01	1238
2015-01-01	930
2015-04-01	173
2015-07-01	984
2015-10-01	1353
2016-01-01	1764
2016-04-01	-359
2016-07-01	-230
2016-10-01	-753
2017-04-01	578
2017-07-01	1679
2017-10-01	-464
2018-01-01	-630
2018-04-01	-598