Year | Value | 2021 | 60.331 | 2020 | 59.94 | 2019 | 60.841 | 2018 | 60.694 | 2017 | 60.235 | 2016 | 59.704 | 2015 | 59.468 | 2014 | 58.969 | 2013 | 58.463 | 2012 | 58.08 | 2011 | 57.723 | 2010 | 57.328 | 2009 | 56.753 | 2008 | 56.097 | 2007 | 55.74 | 2006 | 55.487 | 2005 | 54.851 | 2004 | 54.346 | 2003 | 53.579 | 2002 | 52.776 | 2001 | 51.602 | 2000 | 50.689 | 1999 | 49.905 | 1998 | 49.348 | 1997 | 48.74 | 1996 | 47.906 | 1995 | 48.169 | 1994 | 48.318 | 1993 | 48.327 | 1992 | 47.895 | 1991 | 47.58 | 1990 | 47.098 | 1989 | 46.24 | 1988 | 45.987 | 1987 | 45.221 | 1986 | 44.419 | 1985 | 43.645 | 1984 | 43.214 | 1983 | 42.611 | 1982 | 42.525 | 1981 | 41.954 | 1980 | 41.637 | 1979 | 40.98 | 1978 | 40.152 | 1977 | 39.206 | 1976 | 38.325 | 1975 | 37.384 | 1974 | 36.556 | 1973 | 35.574 | 1972 | 34.771 | 1971 | 33.731 | 1970 | 33.302 | 1969 | 32.82 | 1968 | 32.379 | 1967 | 31.964 | 1966 | 31.597 | 1965 | 31.417 | 1964 | 31.114 | 1963 | 30.869 | 1962 | 30.693 | 1961 | 30.563 | 1960 | 30.493 |
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