Year | Value | 2021 | 72.043 | 2020 | 72.173 | 2019 | 75.439 | 2018 | 75.064 | 2017 | 74.906 | 2016 | 74.664 | 2015 | 74.436 | 2014 | 74.058 | 2013 | 73.676 | 2012 | 73.454 | 2011 | 73.305 | 2010 | 73.16 | 2009 | 72.813 | 2008 | 72.398 | 2007 | 72.327 | 2006 | 71.987 | 2005 | 71.792 | 2004 | 71.421 | 2003 | 71.436 | 2002 | 71.018 | 2001 | 70.932 | 2000 | 70.624 | 1999 | 70.257 | 1998 | 70.514 | 1997 | 69.91 | 1996 | 69.783 | 1995 | 69.311 | 1994 | 69.073 | 1993 | 68.841 | 1992 | 68.627 | 1991 | 68.643 | 1990 | 68.821 | 1989 | 68.703 | 1988 | 53.9 | 1987 | 68.095 | 1986 | 68.18 | 1985 | 67.93 | 1984 | 67.507 | 1983 | 67.195 | 1982 | 66.89 | 1981 | 66.579 | 1980 | 66.177 | 1979 | 66.041 | 1978 | 65.701 | 1977 | 65.364 | 1976 | 65.161 | 1975 | 64.962 | 1974 | 64.825 | 1973 | 64.611 | 1972 | 64.535 | 1971 | 64.208 | 1970 | 63.873 | 1969 | 63.656 | 1968 | 63.334 | 1967 | 63.213 | 1966 | 62.945 | 1965 | 62.754 | 1964 | 62.418 | 1963 | 62.223 | 1962 | 62.125 | 1961 | 61.803 | 1960 | 61.431 |
|