Year | Value | 2021 | 61.663 | 2020 | 61.566 | 2019 | 62.351 | 2018 | 61.688 | 2017 | 61.553 | 2016 | 60.793 | 2015 | 60.217 | 2014 | 59.868 | 2013 | 59.235 | 2012 | 58.493 | 2011 | 57.769 | 2010 | 57.081 | 2009 | 56.388 | 2008 | 55.71 | 2007 | 54.727 | 2006 | 53.869 | 2005 | 53.023 | 2004 | 52.01 | 2003 | 50.857 | 2002 | 49.891 | 2001 | 48.431 | 2000 | 47.514 | 1999 | 47.528 | 1998 | 46.552 | 1997 | 45.387 | 1996 | 44.373 | 1995 | 44.059 | 1994 | 44.08 | 1993 | 37.105 | 1992 | 43.895 | 1991 | 44.227 | 1990 | 44.86 | 1989 | 45.62 | 1988 | 43.04 | 1987 | 47.516 | 1986 | 48.164 | 1985 | 48.541 | 1984 | 48.491 | 1983 | 48.051 | 1982 | 47.29 | 1981 | 46.393 | 1980 | 45.406 | 1979 | 44.59 | 1978 | 43.764 | 1977 | 43.513 | 1976 | 43.144 | 1975 | 42.982 | 1974 | 43.012 | 1973 | 37.275 | 1972 | 25.613 | 1971 | 42.965 | 1970 | 43.041 | 1969 | 42.874 | 1968 | 43.378 | 1967 | 43.341 | 1966 | 43.531 | 1965 | 42.005 | 1964 | 43.974 | 1963 | 43.718 | 1962 | 43.441 | 1961 | 43.252 | 1960 | 43.024 |
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