Year | Value | 2021 | 60.656 | 2020 | 61.023 | 2019 | 62.33 | 2018 | 61.826 | 2017 | 61.709 | 2016 | 61.763 | 2015 | 61.403 | 2014 | 61.064 | 2013 | 61.141 | 2012 | 60.849 | 2011 | 60.502 | 2010 | 59.787 | 2009 | 59.215 | 2008 | 59.048 | 2007 | 58.22 | 2006 | 57.602 | 2005 | 56.811 | 2004 | 56.573 | 2003 | 55.998 | 2002 | 55.265 | 2001 | 55.084 | 2000 | 54.95 | 1999 | 54.659 | 1998 | 54.431 | 1997 | 53.972 | 1996 | 53.946 | 1995 | 53.384 | 1994 | 52.727 | 1993 | 51.701 | 1992 | 50.995 | 1991 | 50.281 | 1990 | 49.66 | 1989 | 49.04 | 1988 | 48.545 | 1987 | 47.787 | 1986 | 47.153 | 1985 | 46.636 | 1984 | 45.991 | 1983 | 45.468 | 1982 | 44.881 | 1981 | 41.984 | 1980 | 43.685 | 1979 | 43.101 | 1978 | 42.141 | 1977 | 42.073 | 1976 | 41.532 | 1975 | 40.942 | 1974 | 40.438 | 1973 | 40.017 | 1972 | 39.515 | 1971 | 39.017 | 1970 | 38.62 | 1969 | 38.079 | 1968 | 37.617 | 1967 | 37.182 | 1966 | 36.706 | 1965 | 36.175 | 1964 | 35.684 | 1963 | 35.28 | 1962 | 34.804 | 1961 | 34.367 | 1960 | 33.912 |
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