Year | Value | 2021 | 75.463 | 2020 | 75.305 | 2019 | 75.298 | 2018 | 75.046 | 2017 | 74.433 | 2016 | 74.582 | 2015 | 74.379 | 2014 | 74.134 | 2013 | 73.884 | 2012 | 73.613 | 2011 | 73.368 | 2010 | 73.08 | 2009 | 72.831 | 2008 | 72.389 | 2007 | 72.248 | 2006 | 72.043 | 2005 | 71.619 | 2004 | 71.275 | 2003 | 70.91 | 2002 | 70.538 | 2001 | 70.162 | 2000 | 69.723 | 1999 | 69.38 | 1998 | 68.916 | 1997 | 68.558 | 1996 | 68.152 | 1995 | 67.833 | 1994 | 67.414 | 1993 | 67.006 | 1992 | 66.608 | 1991 | 66.099 | 1990 | 65.714 | 1989 | 65.478 | 1988 | 65.202 | 1987 | 64.912 | 1986 | 64.646 | 1985 | 64.338 | 1984 | 64.017 | 1983 | 63.623 | 1982 | 63.212 | 1981 | 62.737 | 1980 | 62.206 | 1979 | 61.677 | 1978 | 61.05 | 1977 | 60.402 | 1976 | 59.692 | 1975 | 58.823 | 1974 | 58.123 | 1973 | 57.449 | 1972 | 56.525 | 1971 | 55.703 | 1970 | 54.685 | 1969 | 53.804 | 1968 | 53.106 | 1967 | 52.37 | 1966 | 51.639 | 1965 | 50.868 | 1964 | 50.157 | 1963 | 49.407 | 1962 | 48.813 | 1961 | 38.982 | 1960 | 32.11 |
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