Quarter	Millions of US Dollars
1972-04-01	20
1972-07-01	20
1972-10-01	20
1973-01-01	22
1973-04-01	24
1973-07-01	24
1973-10-01	21
1974-01-01	21
1974-04-01	21
1974-07-01	21
1974-10-01	22
1975-01-01	24
1975-04-01	25
1975-07-01	22
1975-10-01	22
1976-01-01	21
1976-04-01	21
1976-07-01	20
1976-10-01	20
1977-01-01	20
1977-04-01	22
1977-07-01	22
1977-10-01	23
1978-01-01	24
1978-04-01	24
1978-07-01	25
1978-10-01	26
1979-01-01	25
1979-04-01	25
1979-07-01	26
1979-10-01	27
1980-01-01	24
1980-04-01	26
1980-07-01	26
1980-10-01	24
1981-01-01	22
1981-04-01	19
1981-07-01	20
1981-10-01	19
1982-01-01	18
1982-04-01	17
1982-07-01	16
1982-10-01	17
1983-01-01	16
1983-04-01	15
1983-07-01	15
1983-10-01	14
1984-01-01	15
1984-04-01	14
1984-07-01	13
1984-10-01	12
1985-01-01	13
1985-04-01	13
1985-07-01	14
1985-10-01	3
1986-01-01	3
1986-04-01	3
1986-07-01	4
1986-10-01	4
1987-01-01	4
1987-04-01	2
1987-07-01	2
1987-10-01	2
1988-01-01	2
1988-04-01	2
1988-07-01	2
1988-10-01	2
1989-01-01	2
1989-04-01	2
1989-07-01	2
1989-10-01	2
1990-01-01	2
1990-04-01	2
1990-07-01	2
1990-10-01	2
1991-01-01	2
1991-04-01	2
1991-07-01	2
1991-10-01	2
1992-01-01	2
1992-04-01	2
1992-07-01	2
1992-10-01	2
1993-01-01	2
1993-04-01	2
1993-07-01	2
1993-10-01	2
1994-01-01	2
1994-04-01	2
1994-07-01	2
1994-10-01	32
1995-01-01	32
1995-04-01	32
1995-07-01	32
1995-10-01	2
1996-01-01	62
1996-04-01	102
1996-07-01	87
1996-10-01	2
1997-01-01	2
1997-04-01	2
1997-07-01	2
1997-10-01	2
1998-01-01	2
1998-04-01	2
1998-07-01	2
1998-10-01	2
1999-01-01	2
1999-04-01	2
1999-07-01	2
1999-10-01	2
2000-01-01	2
2000-04-01	2
2000-07-01	2
2000-10-01	2
2001-01-01	2
2001-04-01	2
2001-07-01	2
2001-10-01	2
2002-01-01	2
2002-04-01	2
2002-07-01	172
2002-10-01	172
2003-01-01	172
2003-04-01	170
2003-07-01	170
2003-10-01	170
2004-01-01	170
2004-04-01	170
2004-07-01	170
2004-10-01	170
2005-01-01	170
2005-04-01	170
2005-07-01	320
2005-10-01	320
2006-01-01	320
2006-04-01	320
2006-07-01	420
2006-10-01	420
2007-01-01	420
2007-04-01	420
2007-07-01	420
2007-10-01	740
2008-01-01	740
2008-04-01	740
2008-07-01	740
2008-10-01	740
2009-01-01	740
2009-04-01	740
2009-07-01	740
2009-10-01	740
2010-01-01	740
2010-04-01	740
2010-07-01	740
2010-10-01	740
2011-01-01	740
2011-04-01	740
2011-07-01	740
2011-10-01	1152
2012-01-01	1153
2012-04-01	1149
2012-07-01	1154
2012-10-01	1237
2013-01-01	1238
2013-04-01	1244
2013-07-01	1245
2013-10-01	1079
2014-01-01	1068
2014-04-01	1069
2014-07-01	1073
2014-10-01	430
2015-01-01	430
2015-04-01	430
2015-07-01	430
2015-10-01	430
2016-01-01	430
2016-04-01	1005
2016-07-01	1005
2016-10-01	1005
2017-01-01	1005
2017-04-01	1005
2017-07-01	1005
2017-10-01	1005
2018-01-01	1005
2018-04-01	1230