Year | Value | 2021 | 58.691 | 2020 | 63.142 | 2019 | 62.934 | 2018 | 63.336 | 2017 | 63.968 | 2016 | 62.77 | 2015 | 61.262 | 2014 | 59.781 | 2013 | 59.302 | 2012 | 58.587 | 2011 | 58.173 | 2010 | 58.093 | 2009 | 56.431 | 2008 | 55.689 | 2007 | 54.371 | 2006 | 52.596 | 2005 | 50.783 | 2004 | 49.902 | 2003 | 49.199 | 2002 | 48.837 | 2001 | 48.86 | 2000 | 49.136 | 1999 | 49.692 | 1998 | 50.342 | 1997 | 51.054 | 1996 | 51.669 | 1995 | 51.927 | 1994 | 52.848 | 1993 | 54.749 | 1992 | 54.865 | 1991 | 55.968 | 1990 | 57.057 | 1989 | 58.021 | 1988 | 58.469 | 1987 | 59.292 | 1986 | 59.533 | 1985 | 59.566 | 1984 | 59.337 | 1983 | 59.107 | 1982 | 58.71 | 1981 | 58.277 | 1980 | 57.807 | 1979 | 57.32 | 1978 | 56.815 | 1977 | 56.312 | 1976 | 55.739 | 1975 | 55.136 | 1974 | 54.556 | 1973 | 53.974 | 1972 | 53.397 | 1971 | 52.848 | 1970 | 52.322 | 1969 | 51.856 | 1968 | 51.403 | 1967 | 50.973 | 1966 | 50.56 | 1965 | 50.163 | 1964 | 49.733 | 1963 | 49.29 | 1962 | 48.809 | 1961 | 48.332 | 1960 | 47.842 |
|