Year | Value | 2021 | 61.643 | 2020 | 62.261 | 2019 | 62.448 | 2018 | 62.144 | 2017 | 61.68 | 2016 | 61.092 | 2015 | 60.655 | 2014 | 60.04 | 2013 | 59.307 | 2012 | 58.623 | 2011 | 57.596 | 2010 | 56.726 | 2009 | 55.752 | 2008 | 54.633 | 2007 | 53.642 | 2006 | 52.369 | 2005 | 51.57 | 2004 | 50.592 | 2003 | 49.617 | 2002 | 47.386 | 2001 | 46.59 | 2000 | 46.024 | 1999 | 45.386 | 1998 | 45.057 | 1997 | 46.306 | 1996 | 46.033 | 1995 | 45.849 | 1994 | 43.422 | 1993 | 42.101 | 1992 | 42.209 | 1991 | 43.813 | 1990 | 41.893 | 1989 | 41.765 | 1988 | 41.545 | 1987 | 40.917 | 1986 | 42.843 | 1985 | 42.648 | 1984 | 42.353 | 1983 | 42.092 | 1982 | 43.051 | 1981 | 42.772 | 1980 | 42.449 | 1979 | 42.175 | 1978 | 41.83 | 1977 | 41.437 | 1976 | 41.163 | 1975 | 41.191 | 1974 | 41.652 | 1973 | 41.27 | 1972 | 40.905 | 1971 | 40.554 | 1970 | 40.19 | 1969 | 39.829 | 1968 | 39.484 | 1967 | 39.092 | 1966 | 38.757 | 1965 | 38.495 | 1964 | 38.131 | 1963 | 37.824 | 1962 | 37.539 | 1961 | 37.267 | 1960 | 38.211 |
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