Quarter	Millions of US Dollars
1967-04-01	25
1971-01-01	11
1972-01-01	45
1972-04-01	21
1972-07-01	101
1972-10-01	78
1973-01-01	30
1973-04-01	22
1974-10-01	18
1975-01-01	22
1975-07-01	84
1975-10-01	126
1976-01-01	53
1976-04-01	85
1976-07-01	221
1976-10-01	65
1977-01-01	123
1977-04-01	42
1977-07-01	32
1977-10-01	128
1978-01-01	175
1978-04-01	96
1978-07-01	244
1978-10-01	94
1979-01-01	164
1979-04-01	109
1979-07-01	71
1979-10-01	-21
1980-01-01	115
1980-04-01	292
1980-07-01	226
1980-10-01	92
1981-01-01	200
1981-04-01	24
1981-07-01	160
1981-10-01	111
1982-01-01	278
1982-04-01	114
1982-07-01	-135
1982-10-01	207
1983-01-01	74
1983-04-01	206
1983-10-01	822
1984-01-01	927
1984-04-01	288
1984-07-01	1132
1984-10-01	455
1985-01-01	215
1985-04-01	689
1985-07-01	-452
1985-10-01	-335
1986-01-01	-180
1986-04-01	708
1986-07-01	2683
1986-10-01	1627
1987-01-01	2558
1987-04-01	-93
1987-07-01	133
1987-10-01	24
1988-01-01	-244
1988-04-01	397
1988-07-01	-151
1988-10-01	-1236
1989-01-01	-492
1989-04-01	-28
1989-07-01	-275
1989-10-01	637
1990-01-01	1418
1990-04-01	-549
1990-07-01	750
1990-10-01	-256
1991-01-01	-922
1991-04-01	-315
1991-07-01	-820
1991-10-01	-1764
1992-01-01	-2850
1992-04-01	-342
1992-07-01	100
1992-10-01	531
1993-01-01	1253
1993-04-01	1193
1993-07-01	6507
1993-10-01	485
1994-01-01	-822
1994-04-01	-1205
1994-07-01	-195
1994-10-01	-304
1995-01-01	-777
1995-04-01	-29
1995-07-01	-648
1995-10-01	-165
1996-01-01	-542
1996-04-01	141
1996-07-01	-222
1996-10-01	392
1997-01-01	809
1997-04-01	133
1997-07-01	-151
1997-10-01	-882
1998-01-01	-860
1998-04-01	-1113
1998-07-01	-570
1998-10-01	-847
1999-01-01	52
1999-04-01	-205
1999-07-01	771
1999-10-01	-816
2000-01-01	-981
2000-04-01	-159
2000-07-01	181
2000-10-01	121
2001-01-01	-386
2001-04-01	364
2001-07-01	-398
2001-10-01	-656
2002-01-01	-544
2002-04-01	-424
2002-07-01	-33
2002-10-01	-1205
2003-01-01	-431
2003-04-01	1943
2003-07-01	-886
2003-10-01	-849
2004-01-01	-266
2004-04-01	-465
2004-07-01	-496
2004-10-01	-417
2005-01-01	2383
2005-04-01	-689
2005-07-01	-679
2006-01-01	-61
2006-04-01	-62
2006-10-01	-1056
2007-01-01	-45
2007-04-01	-25
2007-07-01	-120
2007-10-01	-190
2008-01-01	-112
2008-07-01	-592
2008-10-01	6148
2009-01-01	4327
2009-04-01	5735
2009-07-01	-353
2009-10-01	-339
2010-01-01	127
2010-04-01	-1990
2010-07-01	22
2010-10-01	-453
2011-01-01	5953
2011-04-01	600
2011-07-01	2690
2011-10-01	-5920
2012-01-01	-2690
2012-04-01	-1643
2012-07-01	-170
2012-10-01	-137
2013-01-01	-5211
2013-04-01	1533
2013-07-01	-20
2013-10-01	-73
2014-01-01	-1504
2014-04-01	-441
2014-07-01	-231
2014-10-01	-130
2015-01-01	-151
2015-04-01	-1267
2015-07-01	-407
2015-10-01	-1617
2016-01-01	-2755
2016-04-01	-1338
2016-07-01	-323
2016-10-01	51
2017-01-01	-2810