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
1977-01-01	41
1977-04-01	15
1977-10-01	17
1978-01-01	21
1978-07-01	4
1979-01-01	10
1981-01-01	36
1982-01-01	16
1982-04-01	51
1982-10-01	-14
1983-01-01	57
1983-04-01	23
1983-10-01	22
1984-04-01	-11
1985-07-01	125
1985-10-01	39
1986-01-01	-1
1986-04-01	48
1986-07-01	-6
1986-10-01	-21
1987-01-01	52
1987-04-01	-9
1987-07-01	-7
1987-10-01	-18
1988-01-01	-20
1988-04-01	0
1988-07-01	-4
1988-10-01	-10
1989-01-01	72
1989-04-01	91
1989-10-01	-16
1990-01-01	-34
1990-10-01	-8
1991-01-01	0
1991-04-01	130
1991-10-01	-8
1992-01-01	109
1992-04-01	-62
1992-07-01	74
1992-10-01	-18
1993-01-01	34
1993-04-01	191
1993-07-01	214
1993-10-01	-9
1994-01-01	219
1994-04-01	-180
1994-07-01	129
1994-10-01	129
1995-01-01	187
1995-04-01	28
1995-07-01	-17
1995-10-01	-20
1996-01-01	109
1996-04-01	-30
1996-07-01	98
1996-10-01	-11
1997-01-01	11
1997-04-01	-64
1997-07-01	-27
1997-10-01	-9
1998-01-01	27
1998-04-01	-20
1998-07-01	-26
1998-10-01	30
1999-01-01	152
1999-04-01	303
1999-07-01	346
1999-10-01	177
2000-01-01	254
2000-04-01	488
2000-07-01	258
2000-10-01	358
2001-01-01	243
2001-04-01	-48
2001-07-01	-21
2001-10-01	454
2002-01-01	-143
2002-04-01	422
2002-07-01	345
2002-10-01	-304
2003-01-01	235
2003-04-01	959
2003-07-01	895
2003-10-01	1418
2004-01-01	1923
2004-04-01	1066
2004-07-01	3679
2004-10-01	3287
2005-01-01	3275
2005-04-01	4790
2005-07-01	3570
2005-10-01	4283
2006-01-01	2333
2006-04-01	888
2006-07-01	3050
2006-10-01	5400
2007-01-01	1439
2007-04-01	1803
2007-07-01	-783
2007-10-01	1297
2008-01-01	1965
2008-04-01	2121
2008-07-01	-820
2008-10-01	-2392
2009-01-01	-3129
2009-04-01	-2914
2009-07-01	-1927
2009-10-01	-3064
2010-01-01	-3300
2010-04-01	-2255
2010-07-01	-209
2010-10-01	-2574
2011-01-01	-1172
2011-04-01	-96
2011-07-01	-2079
2011-10-01	-3550
2012-01-01	-2201
2012-04-01	-1120
2012-07-01	-1980
2012-10-01	-600
2013-01-01	-162
2013-04-01	-132
2013-07-01	-295
2013-10-01	-220
2014-01-01	-159
2014-04-01	-318
2014-07-01	915
2014-10-01	-312
2015-01-01	-137
2015-04-01	-272
2015-07-01	-1838
2015-10-01	500
2016-01-01	101
2016-04-01	-2390
2016-07-01	550
2016-10-01	-717
2017-01-01	787
2017-04-01	336
2017-07-01	-48
2017-10-01	509
2018-01-01	-99
2018-04-01	-16