Year | Value | 2021 | 65.756 | 2020 | 68.615 | 2019 | 69.525 | 2018 | 69.367 | 2017 | 69.159 | 2016 | 68.81 | 2015 | 68.285 | 2014 | 67.651 | 2013 | 66.961 | 2012 | 66.324 | 2011 | 65.765 | 2010 | 65.327 | 2009 | 64.962 | 2008 | 64.654 | 2007 | 64.365 | 2006 | 64.053 | 2005 | 63.719 | 2004 | 63.313 | 2003 | 62.981 | 2002 | 62.573 | 2001 | 62.114 | 2000 | 61.754 | 1999 | 61.351 | 1998 | 61.028 | 1997 | 60.665 | 1996 | 60.277 | 1995 | 59.89 | 1994 | 59.483 | 1993 | 59.054 | 1992 | 58.66 | 1991 | 58.256 | 1990 | 57.876 | 1989 | 57.511 | 1988 | 57.113 | 1987 | 56.726 | 1986 | 56.299 | 1985 | 55.849 | 1984 | 55.387 | 1983 | 54.911 | 1982 | 54.446 | 1981 | 53.988 | 1980 | 53.545 | 1979 | 53.135 | 1978 | 52.71 | 1977 | 52.275 | 1976 | 51.884 | 1975 | 51.418 | 1974 | 50.912 | 1973 | 50.224 | 1972 | 49.694 | 1971 | 49.284 | 1970 | 48.854 | 1969 | 48.456 | 1968 | 48.065 | 1967 | 46.225 | 1966 | 45.898 | 1965 | 45.556 | 1964 | 46.822 | 1963 | 46.58 | 1962 | 46.312 | 1961 | 46.057 | 1960 | 45.884 |
|