Year	Percent
1960-01-01	9.905940000000000
1961-01-01	9.348850000000000
1962-01-01	9.222220000000000
1963-01-01	9.801390000000000
1964-01-01	7.952600000000000
1965-01-01	8.170580000000001
1966-01-01	8.748619999999999
1967-01-01	9.286330000000000
1968-01-01	8.883650000000000
1969-01-01	9.762710000000000
1970-01-01	9.803780000000000
1971-01-01	8.998050000000000
1972-01-01	10.019600000000000
1973-01-01	10.490900000000000
1974-01-01	6.870410000000001
1975-01-01	8.419440000000000
1976-01-01	8.800320000000000
1977-01-01	8.800320000000000
1978-01-01	8.800320000000000
1979-01-01	8.800320000000000
1980-01-01	8.800320000000000
1981-01-01	8.800320000000000
1982-01-01	8.800320000000000
1983-01-01	8.800320000000000
1984-01-01	8.800320000000000
1985-01-01	8.800320000000000
1986-01-01	8.800320000000000
1987-01-01	8.800320000000000
1988-01-01	8.800320000000000
1989-01-01	8.800320000000000
1990-01-01	8.800320000000000
1991-01-01	8.800320000000000
1992-01-01	8.800320000000000
1993-01-01	8.800320000000000
1994-01-01	8.800320000000000
1995-01-01	8.800320000000000
1996-01-01	8.800320000000000
1997-01-01	8.800320000000000
1998-01-01	8.800320000000000
1999-01-01	8.800320000000000
2000-01-01	8.800320000000000
2001-01-01	8.800320000000000
2002-01-01	8.800320000000000
2003-01-01	8.800320000000000
2004-01-01	8.800320000000000
2005-01-01	8.800320000000000
2006-01-01	8.325439999999999
2007-01-01	9.198540000000000
2008-01-01	9.981480000000000
2009-01-01	16.536800000000000
2010-01-01	18.947300000000000
2011-01-01	19.056900000000000
2012-01-01	18.410800000000000
2013-01-01	18.417900000000000
2014-01-01	20.250000000000000
2015-01-01	25.121900000000000
2016-01-01	23.976200000000000