Quarter	Millions of US Dollars
1967-04-01	25
1968-04-01	30
1968-10-01	20
1971-01-01	25
1971-04-01	60
1972-10-01	50
1975-01-01	10
1975-04-01	10
1977-01-01	8
1977-04-01	87
1977-10-01	75
1978-01-01	26
1978-04-01	25
1979-01-01	36
1979-10-01	36
1980-01-01	200
1980-04-01	282
1980-07-01	250
1980-10-01	100
1981-01-01	250
1981-04-01	83
1981-10-01	324
1982-01-01	216
1982-04-01	25
1982-07-01	100
1982-10-01	15
1983-01-01	107
1983-04-01	60
1983-07-01	34
1983-10-01	238
1984-01-01	334
1984-04-01	43
1984-07-01	42
1984-10-01	29
1985-01-01	960
1985-04-01	859
1985-07-01	39
1985-10-01	-123
1986-01-01	-92
1986-04-01	245
1986-07-01	427
1986-10-01	-104
1987-01-01	2
1987-04-01	-353
1987-07-01	50
1987-10-01	200
1988-01-01	-261
1988-04-01	516
1988-07-01	-188
1988-10-01	-200
1989-01-01	-297
1989-04-01	132
1989-07-01	503
1989-10-01	352
1990-01-01	229
1990-04-01	-261
1990-07-01	404
1990-10-01	1253
1991-01-01	549
1991-04-01	-123
1991-07-01	-241
1991-10-01	2
1992-01-01	1386
1992-04-01	1004
1992-07-01	-791
1992-10-01	-373
1993-01-01	-287
1993-04-01	-944
1993-07-01	279
1993-10-01	-100
1994-01-01	-218
1994-04-01	-56
1994-07-01	-167
1994-10-01	210
1995-01-01	-292
1995-04-01	-70
1995-07-01	-14
1995-10-01	-43
1996-01-01	-317
1996-04-01	-73
1996-07-01	-729
1996-10-01	-465
1997-01-01	-116
1997-04-01	-118
1997-07-01	295
1998-01-01	-822
1998-04-01	222
1998-10-01	1750
1999-01-01	-868
1999-04-01	-41
1999-07-01	128
1999-10-01	2130
2000-01-01	118
2000-04-01	1128
2000-07-01	1102
2000-10-01	704
2001-01-01	24
2001-04-01	483
2001-07-01	177
2001-10-01	554
2002-01-01	1675
2002-04-01	210
2002-07-01	43
2002-10-01	499
2003-01-01	-6
2003-04-01	2719
2003-07-01	45
2003-10-01	1616
2004-01-01	3998
2004-04-01	10392
2004-07-01	827
2004-10-01	4413
2005-01-01	1683
2005-04-01	-381
2005-07-01	-1610
2005-10-01	-5495
2006-01-01	2410
2006-04-01	3499
2006-07-01	-5
2006-10-01	1951
2007-01-01	-1769
2007-04-01	8698
2007-07-01	-137
2007-10-01	2261
2008-01-01	-224
2008-04-01	-391
2008-07-01	-376
2008-10-01	-855
2009-01-01	4414
2009-04-01	3414
2009-07-01	2881
2009-10-01	4850
2010-01-01	8611
2010-04-01	95
2010-07-01	2419
2010-10-01	4541
2011-01-01	2732
2011-04-01	-2588
2011-07-01	-918
2011-10-01	442
2012-01-01	3277
2012-04-01	2820
2012-07-01	7412
2012-10-01	8166
2013-01-01	4579
2013-04-01	4745
2013-07-01	13639
2013-10-01	12959
2014-01-01	3556
2014-04-01	-576
2014-07-01	6133
2014-10-01	-1472
2015-01-01	4238
2015-04-01	-631
2015-07-01	1136
2015-10-01	-275
2016-01-01	-9530
2016-04-01	3819
2016-07-01	4070
2016-10-01	-527
2017-01-01	4510
2017-04-01	1161
2017-07-01	4857
2017-10-01	12504
2018-01-01	-716
2018-04-01	1097