Year | Value | 2021 | 72.182 | 2020 | 72.546 | 2019 | 73.857 | 2018 | 73.631 | 2017 | 73.526 | 2016 | 72.933 | 2015 | 73.294 | 2014 | 73.424 | 2013 | 73.011 | 2012 | 72.939 | 2011 | 72.841 | 2010 | 72.516 | 2009 | 72.694 | 2008 | 72.276 | 2007 | 71.487 | 2006 | 72.066 | 2005 | 71.692 | 2004 | 71.53 | 2003 | 70.83 | 2002 | 70.752 | 2001 | 70.749 | 2000 | 70.583 | 1999 | 70.407 | 1998 | 70.149 | 1997 | 69.705 | 1996 | 70.123 | 1995 | 69.95 | 1994 | 70.18 | 1993 | 69.16 | 1992 | 69.095 | 1991 | 68.957 | 1990 | 68.552 | 1989 | 68.09 | 1988 | 67.711 | 1987 | 67.148 | 1986 | 66.655 | 1985 | 66.141 | 1984 | 65.44 | 1983 | 65.518 | 1982 | 65.083 | 1981 | 65.125 | 1980 | 64.826 | 1979 | 64.708 | 1978 | 64.38 | 1977 | 63.93 | 1976 | 63.367 | 1975 | 63.291 | 1974 | 62.803 | 1973 | 62.708 | 1972 | 62.361 | 1971 | 62.028 | 1970 | 61.971 | 1969 | 61.243 | 1968 | 61.317 | 1967 | 61.524 | 1966 | 61.525 | 1965 | 61.235 | 1964 | 61.037 | 1963 | 61.178 | 1962 | 61.035 | 1961 | 61.24 | 1960 | 60.916 |
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