Year | Value | 2021 | 73.284 | 2020 | 73.274 | 2019 | 73.198 | 2018 | 73.031 | 2017 | 72.978 | 2016 | 72.805 | 2015 | 72.784 | 2014 | 72.942 | 2013 | 72.319 | 2012 | 71.626 | 2011 | 70.978 | 2010 | 70.419 | 2009 | 69.732 | 2008 | 68.958 | 2007 | 68.911 | 2006 | 69.085 | 2005 | 69.285 | 2004 | 69.437 | 2003 | 69.546 | 2002 | 60.792 | 2001 | 60.745 | 2000 | 60.763 | 1999 | 60.798 | 1998 | 60.906 | 1997 | 60.974 | 1996 | 60.956 | 1995 | 60.894 | 1994 | 70.718 | 1993 | 71.871 | 1992 | 70.824 | 1991 | 70.313 | 1990 | 70.21 | 1989 | 70.039 | 1988 | 69.803 | 1987 | 69.442 | 1986 | 69.147 | 1985 | 68.681 | 1984 | 68.19 | 1983 | 67.677 | 1982 | 67.167 | 1981 | 66.658 | 1980 | 66.158 | 1979 | 65.672 | 1978 | 65.187 | 1977 | 64.655 | 1976 | 64.143 | 1975 | 63.526 | 1974 | 62.962 | 1973 | 62.386 | 1972 | 61.807 | 1971 | 61.176 | 1970 | 60.571 | 1969 | 59.926 | 1968 | 59.175 | 1967 | 58.409 | 1966 | 57.598 | 1965 | 56.827 | 1964 | 56.157 | 1963 | 55.56 | 1962 | 54.999 | 1961 | 54.496 | 1960 | 54.05 |
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