Year	Percent
1962-01-01	8.116880000000000
1963-01-01	8.116880000000000
1964-01-01	8.116880000000000
1965-01-01	8.116880000000000
1966-01-01	8.116880000000000
1967-01-01	8.164100000000000
1968-01-01	8.479540000000000
1969-01-01	9.368380000000000
1970-01-01	8.363130000000000
1971-01-01	9.685520000000000
1972-01-01	11.215400000000000
1973-01-01	12.734800000000000
1974-01-01	14.116800000000000
1975-01-01	12.722400000000000
1976-01-01	10.836500000000000
1977-01-01	11.890600000000000
1978-01-01	12.765800000000000
1979-01-01	13.741600000000000
1980-01-01	13.619100000000000
1981-01-01	15.126600000000000
1982-01-01	14.006900000000000
1983-01-01	11.997400000000000
1984-01-01	14.981600000000000
1985-01-01	17.079400000000000
1986-01-01	18.677100000000000
1987-01-01	17.995300000000000
1988-01-01	18.858600000000000
1989-01-01	20.017700000000000
1990-01-01	20.501900000000000
1991-01-01	18.877800000000000
1992-01-01	19.382300000000000
1993-01-01	19.354900000000000
1994-01-01	16.543200000000000
1995-01-01	15.245400000000000
1996-01-01	13.791200000000000
1997-01-01	11.256700000000000
1998-01-01	7.855589999999999
1999-01-01	7.294300000000000
2000-01-01	8.355060000000000
2001-01-01	9.139960000000000
2002-01-01	9.651110000000001
2003-01-01	10.826900000000000
2004-01-01	13.897300000000000
2005-01-01	14.019200000000000
2006-01-01	14.266100000000000
2007-01-01	15.480400000000000
2008-01-01	15.684800000000000
2009-01-01	16.658100000000000
2010-01-01	18.275700000000000
2011-01-01	19.533600000000000
2012-01-01	19.722900000000000
2013-01-01	22.311700000000000
2014-01-01	24.266700000000000
2015-01-01	26.319700000000000
2016-01-01	26.548800000000000