Year | Value | 2021 | 68.2 | 2020 | 66.954 | 2019 | 69.559 | 2018 | 69.559 | 2017 | 67.513 | 2016 | 65.614 | 2015 | 67.515 | 2014 | 66.522 | 2013 | 65.694 | 2012 | 65.418 | 2011 | 64.876 | 2010 | 63.929 | 2009 | 63.266 | 2008 | 60.716 | 2007 | 58.215 | 2006 | 58.189 | 2005 | 60.137 | 2004 | 60.435 | 2003 | 61.525 | 2002 | 64.005 | 2001 | 64.041 | 2000 | 63.734 | 1999 | 63.295 | 1998 | 63.004 | 1997 | 63.254 | 1996 | 63.825 | 1995 | 63.66 | 1994 | 63.841 | 1993 | 63.974 | 1992 | 63.916 | 1991 | 58.436 | 1990 | 53.542 | 1989 | 53.293 | 1988 | 50.333 | 1987 | 54.587 | 1986 | 54.168 | 1985 | 53.922 | 1984 | 53.418 | 1983 | 53.236 | 1982 | 53.014 | 1981 | 52.484 | 1980 | 56.204 | 1979 | 61.91 | 1978 | 61.529 | 1977 | 61.334 | 1976 | 60.817 | 1975 | 57.434 | 1974 | 56.873 | 1973 | 59.078 | 1972 | 58.471 | 1971 | 57.989 | 1970 | 57.189 | 1969 | 56.119 | 1968 | 55.687 | 1967 | 55.307 | 1966 | 54.005 | 1965 | 53.335 | 1964 | 52.349 | 1963 | 51.525 | 1962 | 51.029 | 1961 | 50.183 | 1960 | 49.537 |
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