Year | Value | 2021 | 78.715 | 2020 | 79.274 | 2019 | 78.975 | 2018 | 78.662 | 2017 | 78.394 | 2016 | 78.049 | 2015 | 77.717 | 2014 | 77.415 | 2013 | 77.083 | 2012 | 76.772 | 2011 | 76.421 | 2010 | 76.131 | 2009 | 75.842 | 2008 | 75.492 | 2007 | 75.187 | 2006 | 74.938 | 2005 | 73.82 | 2004 | 73.08 | 2003 | 73.155 | 2002 | 72.93 | 2001 | 72.613 | 2000 | 72.316 | 1999 | 72.542 | 1998 | 72.862 | 1997 | 72.501 | 1996 | 71.653 | 1995 | 70.948 | 1994 | 71.227 | 1993 | 71.068 | 1992 | 70.885 | 1991 | 70.717 | 1990 | 70.445 | 1989 | 70.122 | 1988 | 69.689 | 1987 | 69.448 | 1986 | 68.419 | 1985 | 67.587 | 1984 | 66.733 | 1983 | 65.789 | 1982 | 65.163 | 1981 | 64.595 | 1980 | 64.012 | 1979 | 63.209 | 1978 | 62.74 | 1977 | 62.354 | 1976 | 61.978 | 1975 | 61.272 | 1974 | 60.552 | 1973 | 59.836 | 1972 | 59.051 | 1971 | 58.524 | 1970 | 57.711 | 1969 | 56.932 | 1968 | 56.207 | 1967 | 55.754 | 1966 | 55.254 | 1965 | 54.712 | 1964 | 53.978 | 1963 | 53.244 | 1962 | 52.79 | 1961 | 52.364 | 1960 | 51.035 |
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