Quarter	Millions of US Dollars
1966-04-01	10
1967-04-01	25
1971-01-01	26
1971-10-01	12
1972-01-01	58
1972-04-01	44
1972-07-01	101
1972-10-01	128
1973-01-01	43
1973-04-01	43
1973-07-01	43
1973-10-01	42
1974-01-01	16
1974-04-01	3
1974-10-01	52
1975-01-01	22
1975-04-01	78
1975-07-01	84
1975-10-01	126
1976-01-01	126
1976-04-01	117
1976-07-01	299
1976-10-01	245
1977-01-01	288
1977-04-01	174
1977-07-01	129
1977-10-01	234
1978-01-01	233
1978-04-01	219
1978-07-01	324
1978-10-01	137
1979-01-01	181
1979-04-01	153
1979-07-01	212
1979-10-01	49
1980-01-01	201
1980-04-01	377
1980-07-01	360
1980-10-01	106
1981-01-01	208
1981-04-01	207
1981-07-01	330
1981-10-01	189
1982-01-01	237
1982-04-01	244
1982-07-01	-96
1982-10-01	249
1983-01-01	120
1983-04-01	275
1983-07-01	230
1983-10-01	821
1984-01-01	1113
1984-04-01	417
1984-07-01	1121
1984-10-01	814
1985-01-01	270
1985-04-01	983
1985-07-01	-533
1985-10-01	148
1986-01-01	26
1986-04-01	975
1986-07-01	3207
1986-10-01	1759
1987-01-01	2858
1987-04-01	306
1987-07-01	120
1987-10-01	265
1988-01-01	257
1988-04-01	1063
1988-07-01	-77
1988-10-01	-438
1989-01-01	208
1989-04-01	512
1989-07-01	361
1989-10-01	809
1990-01-01	1941
1990-04-01	-532
1990-07-01	857
1990-10-01	-198
1991-01-01	-1200
1991-04-01	-426
1991-07-01	-1015
1991-10-01	-2065
1992-01-01	-2724
1992-04-01	-583
1992-07-01	-101
1992-10-01	-119
1993-01-01	1232
1993-04-01	578
1993-07-01	7522
1993-10-01	-110
1994-01-01	-642
1994-04-01	-1738
1994-07-01	127
1994-10-01	-572
1995-01-01	-573
1995-04-01	145
1995-07-01	-119
1995-10-01	-355
1996-01-01	-562
1996-04-01	683
1996-07-01	481
1996-10-01	121
1997-01-01	769
1997-04-01	1026
1997-07-01	-456
1997-10-01	-383
1998-01-01	-865
1998-04-01	55
1998-07-01	257
1998-10-01	-733
1999-01-01	707
1999-04-01	335
1999-07-01	2463
1999-10-01	-875
2000-01-01	-51
2000-04-01	404
2000-07-01	452
2000-10-01	966
2001-01-01	2158
2001-04-01	1846
2001-07-01	-82
2001-10-01	91
2002-01-01	-387
2002-04-01	-715
2002-07-01	7
2002-10-01	174
2003-01-01	3400
2003-04-01	3492
2003-07-01	631
2003-10-01	1111
2004-01-01	2541
2004-04-01	1283
2004-07-01	-835
2004-10-01	1786
2005-01-01	8677
2005-04-01	4726
2005-07-01	1413
2005-10-01	5603
2006-01-01	2282
2006-04-01	3964
2006-07-01	488
2006-10-01	5199
2007-01-01	6282
2007-04-01	5488
2007-07-01	-3339
2007-10-01	-1094
2008-01-01	-101
2008-04-01	6369
2008-07-01	7714
2008-10-01	6124
2009-01-01	13847
2009-04-01	10441
2009-07-01	6605
2009-10-01	89
2010-01-01	-830
2010-04-01	6188
2010-07-01	-17234
2010-10-01	803
2011-01-01	11405
2011-04-01	-574
2011-07-01	3963
2011-10-01	-8912
2012-01-01	3202
2012-04-01	-7265
2012-07-01	4515
2012-10-01	3161
2013-01-01	-4534
2013-04-01	-4005
2013-07-01	-743
2013-10-01	404
2014-01-01	-3741
2014-04-01	-2283
2014-07-01	1613
2014-10-01	1402
2015-01-01	5095
2015-04-01	-1605
2015-07-01	2097
2015-10-01	-455
2016-01-01	1502
2016-04-01	-67
2016-07-01	3400
2016-10-01	-452
2017-01-01	1479
2017-04-01	-592
2017-07-01	-958
2017-10-01	-1294
2018-01-01	-2680
2018-04-01	1812