Year | Value | 2021 | 72.422 | 2020 | 71.185 | 2019 | 73.428 | 2018 | 73.293 | 2017 | 73.235 | 2016 | 72.38 | 2015 | 71.213 | 2014 | 71.175 | 2013 | 70.702 | 2012 | 70.518 | 2011 | 70.348 | 2010 | 70.145 | 2009 | 69.589 | 2008 | 69.351 | 2007 | 69.422 | 2006 | 69.549 | 2005 | 69.873 | 2004 | 69.917 | 2003 | 69.925 | 2002 | 70.114 | 2001 | 69.965 | 2000 | 69.849 | 1999 | 69.002 | 1998 | 67.868 | 1997 | 68.321 | 1996 | 68.842 | 1995 | 69.165 | 1994 | 69.542 | 1993 | 69.708 | 1992 | 69.376 | 1991 | 66.696 | 1990 | 63.701 | 1989 | 63.574 | 1988 | 65.966 | 1987 | 68.697 | 1986 | 68.615 | 1985 | 68.547 | 1984 | 68.219 | 1983 | 68.154 | 1982 | 67.726 | 1981 | 67.601 | 1980 | 67.461 | 1979 | 67.69 | 1978 | 67.291 | 1977 | 67.138 | 1976 | 66.632 | 1975 | 65.757 | 1974 | 65.197 | 1973 | 65.027 | 1972 | 64.349 | 1971 | 63.876 | 1970 | 63.246 | 1969 | 62.628 | 1968 | 61.967 | 1967 | 61.522 | 1966 | 60.848 | 1965 | 60.05 | 1964 | 59.083 | 1963 | 58.574 | 1962 | 57.811 | 1961 | 56.822 | 1960 | 55.865 |
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