Quarter	Millions of US Dollars
1972-04-01	25
1973-01-01	30
1973-04-01	17
1976-04-01	3
1976-07-01	7
1977-07-01	43
1978-04-01	68
1978-10-01	52
1979-01-01	103
1979-07-01	50
1980-04-01	-25
1981-04-01	-4
1982-01-01	314
1982-04-01	40
1982-10-01	300
1983-01-01	62
1983-04-01	212
1983-07-01	850
1983-10-01	107
1984-01-01	320
1984-04-01	6
1984-07-01	153
1984-10-01	600
1985-04-01	846
1985-07-01	12
1985-10-01	1060
1986-10-01	44
1987-04-01	82
1987-07-01	84
1987-10-01	-37
1988-01-01	203
1988-04-01	-328
1988-07-01	59
1988-10-01	-2
1989-01-01	124
1989-04-01	-260
1989-07-01	-105
1989-10-01	153
1990-04-01	-3
1990-07-01	200
1990-10-01	-152
1991-04-01	218
1992-01-01	-117
1992-04-01	-50
1992-10-01	-1074
1993-07-01	-700
1993-10-01	154
1994-04-01	92
1994-07-01	-210
1994-10-01	160
1995-04-01	-498
1995-07-01	1550
1995-10-01	350
1996-01-01	326
1996-04-01	304
1996-07-01	115
1996-10-01	1960
1997-01-01	379
1997-04-01	2111
1997-07-01	661
1997-10-01	381
1998-01-01	-511
1998-04-01	7
1998-07-01	-161
1998-10-01	7
1999-01-01	890
1999-04-01	900
1999-07-01	657
1999-10-01	-114
2000-01-01	-128
2000-04-01	182
2000-07-01	289
2000-10-01	1060
2001-01-01	152
2001-04-01	544
2001-07-01	1105
2001-10-01	-42
2002-01-01	1180
2002-04-01	2480
2002-07-01	405
2002-10-01	1133
2003-01-01	-82
2003-04-01	35
2003-07-01	-769
2003-10-01	265
2004-01-01	1659
2004-04-01	139
2004-07-01	1771
2004-10-01	1549
2005-01-01	8
2005-04-01	1279
2005-07-01	504
2005-10-01	-802
2006-01-01	1212
2006-04-01	125
2006-07-01	647
2006-10-01	641
2007-01-01	268
2007-04-01	-546
2007-07-01	109
2007-10-01	207
2008-01-01	929
2008-04-01	-322
2008-07-01	634
2008-10-01	-532
2009-01-01	-628
2009-04-01	-2228
2009-07-01	4465
2009-10-01	-1033
2010-01-01	668
2010-04-01	2068
2010-07-01	2201
2010-10-01	660
2011-01-01	76
2011-04-01	218
2011-07-01	509
2011-10-01	112
2012-01-01	4080
2012-04-01	3827
2012-07-01	2303
2012-10-01	7
2013-01-01	45
2013-04-01	3227
2013-07-01	53
2013-10-01	2215
2014-01-01	425
2014-04-01	543
2014-07-01	-807
2014-10-01	2627
2015-01-01	4280
2015-04-01	1059
2015-07-01	-354
2015-10-01	533
2016-01-01	719
2016-04-01	2364
2016-07-01	-1316
2016-10-01	2306
2017-01-01	179
2017-04-01	-1248
2017-07-01	-978
2017-10-01	1256
2018-01-01	-842
2018-04-01	-1684