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	87
1975-07-01	286
1975-10-01	33
1976-04-01	150
1976-07-01	71
1976-10-01	191
1977-01-01	30
1977-04-01	231
1977-07-01	173
1977-10-01	110
1978-01-01	303
1978-04-01	174
1978-10-01	316
1979-01-01	96
1979-04-01	152
1979-07-01	157
1979-10-01	0
1980-04-01	94
1980-07-01	-12
1980-10-01	25
1981-01-01	97
1981-04-01	114
1981-07-01	-6
1981-10-01	249
1982-01-01	443
1982-04-01	180
1982-07-01	32
1982-10-01	486
1983-01-01	222
1983-04-01	-126
1983-07-01	-38
1984-01-01	136
1984-04-01	105
1984-07-01	84
1984-10-01	666
1985-01-01	68
1985-04-01	237
1985-07-01	737
1985-10-01	67
1986-01-01	553
1986-04-01	590
1986-07-01	1251
1986-10-01	548
1987-01-01	777
1987-04-01	696
1987-07-01	66
1987-10-01	366
1988-01-01	-254
1988-04-01	951
1988-07-01	-167
1988-10-01	89
1989-01-01	-472
1989-04-01	-34
1989-07-01	75
1989-10-01	198
1990-01-01	-162
1990-04-01	264
1990-07-01	-66
1990-10-01	-299
1991-01-01	-76
1991-04-01	-98
1991-07-01	-153
1991-10-01	-1044
1992-01-01	-138
1992-04-01	-1511
1992-07-01	-524
1992-10-01	-412
1993-01-01	-929
1993-04-01	-498
1993-07-01	237
1993-10-01	-217
1994-01-01	99
1994-04-01	-373
1994-07-01	-191
1994-10-01	45
1995-01-01	-686
1995-04-01	-255
1995-07-01	-365
1995-10-01	213
1996-01-01	-208
1996-04-01	458
1996-07-01	-860
1996-10-01	272
1997-01-01	-216
1997-04-01	132
1997-07-01	-138
1997-10-01	650
1998-01-01	139
1998-04-01	-291
1998-07-01	-186
1998-10-01	-12
1999-01-01	-183
1999-04-01	-332
1999-07-01	211
1999-10-01	-117
2000-01-01	6
2000-04-01	465
2000-07-01	-528
2000-10-01	456
2001-01-01	186
2001-04-01	674
2001-07-01	-395
2001-10-01	103
2002-01-01	-260
2002-04-01	1026
2002-07-01	419
2002-10-01	-963
2003-01-01	1018
2003-04-01	-473
2003-07-01	-649
2003-10-01	-182
2004-01-01	158
2004-04-01	166
2004-07-01	370
2004-10-01	746
2005-01-01	-1313
2005-04-01	-830
2005-07-01	-30
2005-10-01	-1105
2006-01-01	-765
2006-04-01	-23
2006-07-01	-32
2006-10-01	44
2007-01-01	-10
2007-04-01	928
2007-07-01	-505
2007-10-01	2065
2008-01-01	-294
2008-04-01	-644
2008-07-01	-462
2008-10-01	-348
2009-01-01	-27
2009-04-01	-99
2009-07-01	-152
2009-10-01	2153
2010-01-01	45
2010-04-01	630
2010-07-01	204
2010-10-01	3610
2011-01-01	2761
2011-04-01	-770
2011-07-01	2845
2011-10-01	768
2012-01-01	1838
2012-04-01	-289
2012-07-01	1238
2012-10-01	905
2013-01-01	941
2013-04-01	-1755
2013-07-01	500
2013-10-01	409
2014-01-01	-4124
2014-04-01	1036
2014-07-01	83
2014-10-01	-104
2015-01-01	148
2015-04-01	251
2015-07-01	324
2015-10-01	-223
2016-01-01	-147
2016-04-01	3141
2016-07-01	-2696
2016-10-01	-5351
2017-01-01	-446
2017-04-01	48
2017-07-01	-92
2017-10-01	991
2018-01-01	144
2018-04-01	167