Year	Percent
1960-01-01	15.567600000000000
1961-01-01	14.155500000000000
1962-01-01	16.455400000000000
1963-01-01	20.361900000000000
1964-01-01	15.794700000000000
1965-01-01	16.098500000000000
1966-01-01	15.209400000000000
1967-01-01	13.898000000000000
1968-01-01	13.889700000000000
1969-01-01	14.083500000000000
1970-01-01	4.803820000000000
1971-01-01	4.899430000000001
1972-01-01	5.153969999999999
1973-01-01	5.986190000000001
1974-01-01	7.585610000000001
1975-01-01	9.165389999999999
1976-01-01	12.502100000000000
1977-01-01	18.462500000000000
1978-01-01	21.815700000000000
1979-01-01	17.202800000000000
1980-01-01	14.577200000000000
1981-01-01	14.555900000000000
1982-01-01	15.046300000000000
1983-01-01	15.595000000000000
1984-01-01	16.429700000000000
1985-01-01	17.521600000000000
1986-01-01	17.471300000000000
1987-01-01	23.025000000000000
1988-01-01	18.864800000000000
1989-01-01	17.667300000000000
1990-01-01	16.446900000000000
1991-01-01	17.455500000000000
1992-01-01	16.597200000000000
1993-01-01	14.896800000000000
1994-01-01	12.709300000000000
1995-01-01	13.065999999999999
1996-01-01	12.466200000000000
1997-01-01	13.642000000000001
1998-01-01	16.764500000000000
1999-01-01	14.808800000000000
2000-01-01	12.668100000000000
2001-01-01	14.995200000000000
2002-01-01	15.782700000000000
2003-01-01	15.849800000000000
2004-01-01	15.184100000000000
2005-01-01	15.231500000000000
2006-01-01	16.895400000000000
2007-01-01	17.131400000000000
2008-01-01	15.815700000000000
2009-01-01	19.951000000000000
2010-01-01	17.946100000000000
2011-01-01	18.458300000000000
2012-01-01	21.387500000000000
2013-01-01	23.215800000000000
2014-01-01	23.809600000000000
2015-01-01	24.720000000000000
2016-01-01	25.017400000000000