Year | Value | 2021 | 78.235 | 2020 | 79.92 | 2019 | 78.888 | 2018 | 78.777 | 2017 | 78.72 | 2016 | 78.755 | 2015 | 78.656 | 2014 | 78.593 | 2013 | 78.478 | 2012 | 78.422 | 2011 | 78.415 | 2010 | 78.264 | 2009 | 78.266 | 2008 | 78.237 | 2007 | 78.212 | 2006 | 78.06 | 2005 | 77.988 | 2004 | 77.919 | 2003 | 77.718 | 2002 | 77.504 | 2001 | 77.309 | 2000 | 77.114 | 1999 | 77.023 | 1998 | 76.761 | 1997 | 76.379 | 1996 | 76.348 | 1995 | 76.251 | 1994 | 75.582 | 1993 | 75.413 | 1992 | 74.597 | 1991 | 74.451 | 1990 | 73.697 | 1989 | 73.523 | 1988 | 72.766 | 1987 | 72.584 | 1986 | 72.424 | 1985 | 71.665 | 1984 | 71.597 | 1983 | 71.443 | 1982 | 71.399 | 1981 | 70.691 | 1980 | 70.478 | 1979 | 70.337 | 1978 | 70.051 | 1977 | 69.374 | 1976 | 69.097 | 1975 | 67.84 | 1974 | 62.56 | 1973 | 63.02 | 1972 | 60.184 | 1971 | 63.02 | 1970 | 62.557 | 1969 | 62.449 | 1968 | 60.83 | 1967 | 63.58 | 1966 | 63.732 | 1965 | 63.801 | 1964 | 64.083 | 1963 | 63.518 | 1962 | 64.489 | 1961 | 64.305 | 1960 | 63.605 |
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