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
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	8
1978-01-01	21
1979-01-01	10
1981-01-01	36
1982-04-01	51
1982-10-01	-14
1983-01-01	36
1983-04-01	23
1983-10-01	22
1984-04-01	-11
1985-07-01	125
1985-10-01	-52
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	-6
1987-10-01	-8
1988-04-01	0
1988-10-01	-10
1989-01-01	72
1989-04-01	91
1989-10-01	-8
1990-01-01	-34
1990-10-01	-8
1991-01-01	0
1991-04-01	0
1991-10-01	-8
1992-01-01	109
1992-04-01	-62
1992-07-01	74
1992-10-01	-18
1993-04-01	156
1993-07-01	205
1993-10-01	-37
1994-01-01	229
1994-04-01	-120
1994-07-01	78
1994-10-01	68
1995-01-01	176
1995-04-01	28
1995-07-01	-17
1995-10-01	-4
1996-01-01	109
1996-04-01	-11
1996-07-01	98
1996-10-01	-41
1997-01-01	11
1997-04-01	-64
1997-07-01	-27
1997-10-01	-9
1998-01-01	-48
1998-04-01	-20
1998-07-01	-69
1998-10-01	5
1999-01-01	0
1999-04-01	-5
1999-07-01	85
1999-10-01	-45
2000-01-01	24
2000-04-01	-1
2000-07-01	92
2000-10-01	33
2001-01-01	55
2001-04-01	10
2001-07-01	30
2001-10-01	241
2002-01-01	-175
2002-04-01	139
2002-07-01	268
2002-10-01	-64
2003-01-01	-56
2003-04-01	-44
2003-07-01	-19
2003-10-01	-49
2004-01-01	85
2004-04-01	-56
2004-07-01	-5
2004-10-01	-99
2005-01-01	-69
2005-04-01	-115
2005-07-01	-209
2005-10-01	-188
2006-04-01	-201
2006-07-01	-50
2006-10-01	1223
2007-01-01	-197
2007-04-01	-65
2008-04-01	-234
2008-07-01	503
2008-10-01	-441
2009-07-01	-214
2010-04-01	509
2011-04-01	2000
2011-10-01	-1347
2012-04-01	680
2014-01-01	-200
2014-07-01	994
2015-04-01	-195
2015-07-01	-800
2016-01-01	-21
2016-04-01	-1027
2017-10-01	497
2018-01-01	-393