Year	Percent
1962-01-01	16.207600000000000
1963-01-01	17.344800000000000
1964-01-01	17.281200000000000
1965-01-01	17.204900000000000
1966-01-01	16.150900000000000
1967-01-01	17.483300000000000
1968-01-01	18.119800000000000
1969-01-01	18.060000000000000
1970-01-01	12.903300000000000
1971-01-01	13.776600000000000
1972-01-01	14.316100000000000
1973-01-01	13.740300000000000
1974-01-01	12.693900000000000
1975-01-01	12.253000000000000
1976-01-01	12.662700000000000
1977-01-01	13.344700000000000
1978-01-01	14.435900000000000
1979-01-01	14.262900000000000
1980-01-01	15.812800000000000
1981-01-01	17.130000000000000
1982-01-01	15.982800000000000
1983-01-01	15.186400000000000
1984-01-01	15.948400000000000
1985-01-01	17.163300000000000
1986-01-01	17.974000000000000
1987-01-01	16.302700000000000
1988-01-01	15.100900000000000
1989-01-01	13.559500000000000
1990-01-01	14.517999999999999
1991-01-01	16.161200000000000
1992-01-01	15.731800000000000
1993-01-01	14.938800000000000
1994-01-01	13.495600000000000
1995-01-01	11.027600000000000
1996-01-01	9.725580000000000
1997-01-01	9.234470000000000
1998-01-01	8.836500000000000
1999-01-01	7.954710000000000
2000-01-01	8.020640000000000
2001-01-01	8.043880000000000
2002-01-01	8.776769999999999
2003-01-01	7.877850000000000
2004-01-01	8.546920000000000
2005-01-01	8.887460000000000
2006-01-01	9.146189999999999
2007-01-01	9.366670000000000
2008-01-01	9.873920000000000
2009-01-01	11.099800000000000
2010-01-01	11.106300000000000
2011-01-01	10.920700000000000
2012-01-01	10.590300000000000
2013-01-01	11.078900000000000
2014-01-01	11.829700000000000
2015-01-01	12.515700000000000
2016-01-01	12.532600000000000