Year | Value | 2021 | 53.062 | 2020 | 54.693 | 2019 | 54.173 | 2018 | 53.733 | 2017 | 53.064 | 2016 | 52.264 | 2015 | 51.101 | 2014 | 50.033 | 2013 | 49.002 | 2012 | 47.835 | 2011 | 46.692 | 2010 | 45.596 | 2009 | 44.034 | 2008 | 43.566 | 2007 | 43.123 | 2006 | 42.914 | 2005 | 43.233 | 2004 | 43.711 | 2003 | 44.53 | 2002 | 45.595 | 2001 | 46.849 | 2000 | 48.427 | 1999 | 50.081 | 1998 | 51.783 | 1997 | 53.594 | 1996 | 55.232 | 1995 | 56.723 | 1994 | 58.018 | 1993 | 57.991 | 1992 | 58.555 | 1991 | 59.193 | 1990 | 59.398 | 1989 | 59.531 | 1988 | 59.62 | 1987 | 59.495 | 1986 | 59.455 | 1985 | 59.104 | 1984 | 58.635 | 1983 | 58.094 | 1982 | 57.565 | 1981 | 56.902 | 1980 | 56.058 | 1979 | 55.338 | 1978 | 54.669 | 1977 | 54.045 | 1976 | 53.487 | 1975 | 52.987 | 1974 | 52.372 | 1973 | 52.12 | 1972 | 51.722 | 1971 | 51.293 | 1970 | 51.012 | 1969 | 50.702 | 1968 | 50.431 | 1967 | 50.247 | 1966 | 50.148 | 1965 | 50.057 | 1964 | 50.189 | 1963 | 50.263 | 1962 | 50.409 | 1961 | 50.429 | 1960 | 50.364 |
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