Quarter	Millions of US Dollars
1962-10-01	6
1968-04-01	5
1971-01-01	10
1972-01-01	15
1972-04-01	6
1972-10-01	10
1973-07-01	5
1973-10-01	16
1974-04-01	9
1974-10-01	16
1975-07-01	6
1975-10-01	14
1976-01-01	19
1976-07-01	15
1976-10-01	8
1977-01-01	41
1977-04-01	15
1977-07-01	10
1977-10-01	17
1978-01-01	21
1978-07-01	4
1979-01-01	10
1980-10-01	11
1981-01-01	36
1981-04-01	7
1981-10-01	-9
1982-01-01	16
1982-04-01	51
1982-07-01	-12
1982-10-01	-14
1983-01-01	57
1983-04-01	23
1983-10-01	17
1984-01-01	12
1984-04-01	-11
1984-10-01	-4
1985-04-01	17
1985-07-01	155
1985-10-01	174
1986-01-01	38
1986-04-01	86
1986-07-01	112
1986-10-01	40
1987-01-01	52
1987-04-01	49
1987-07-01	39
1987-10-01	28
1988-01-01	12
1988-04-01	148
1988-07-01	37
1988-10-01	76
1989-01-01	210
1989-04-01	92
1989-07-01	1
1989-10-01	133
1990-01-01	-23
1990-04-01	165
1990-07-01	-39
1990-10-01	152
1991-01-01	-55
1991-04-01	123
1991-07-01	45
1991-10-01	32
1992-01-01	352
1992-04-01	36
1992-07-01	166
1992-10-01	-25
1993-01-01	174
1993-04-01	208
1993-07-01	613
1993-10-01	204
1994-01-01	150
1994-04-01	-197
1994-07-01	169
1994-10-01	-21
1995-01-01	194
1995-04-01	7
1995-07-01	-4
1995-10-01	-92
1996-01-01	113
1996-04-01	396
1996-07-01	69
1996-10-01	-242
1997-01-01	-169
1997-04-01	148
1997-07-01	85
1997-10-01	-13
1998-01-01	0
1998-04-01	418
1998-07-01	-158
1998-10-01	643
1999-01-01	457
1999-04-01	410
1999-07-01	283
1999-10-01	221
2000-01-01	605
2000-04-01	558
2000-07-01	221
2000-10-01	752
2001-01-01	1348
2001-04-01	199
2001-07-01	-194
2001-10-01	592
2002-01-01	-412
2002-04-01	725
2002-07-01	-80
2002-10-01	188
2003-01-01	298
2003-04-01	790
2003-07-01	781
2003-10-01	1726
2004-01-01	1652
2004-04-01	1432
2004-07-01	4213
2004-10-01	2835
2005-01-01	4229
2005-04-01	4666
2005-07-01	3416
2005-10-01	5213
2006-01-01	1902
2006-04-01	573
2006-07-01	2145
2006-10-01	6538
2007-01-01	3509
2007-04-01	684
2007-07-01	-777
2007-10-01	817
2008-01-01	1084
2008-04-01	293
2008-07-01	-1431
2008-10-01	-2671
2009-01-01	-3159
2009-04-01	-2185
2009-07-01	146
2009-10-01	-3041
2010-01-01	-2073
2010-04-01	-116
2010-07-01	-2886
2010-10-01	-3056
2011-01-01	-625
2011-04-01	621
2011-07-01	-2261
2011-10-01	-3752
2012-01-01	-2738
2012-04-01	-1241
2012-07-01	-3981
2012-10-01	-2201
2013-01-01	-2407
2013-04-01	-1590
2013-07-01	-146
2013-10-01	-253
2014-01-01	-163
2014-04-01	-352
2014-07-01	915
2014-10-01	-375
2015-01-01	-143
2015-04-01	-1167
2015-07-01	-1838
2015-10-01	455
2016-01-01	101
2016-04-01	-2390
2016-07-01	550
2016-10-01	-717
2017-01-01	354
2017-04-01	336
2017-07-01	-48
2017-10-01	509
2018-01-01	-118
2018-04-01	-16