Year | Value | 2021 | 60.849 | 2020 | 60.486 | 2019 | 60.35 | 2018 | 59.829 | 2017 | 59.814 | 2016 | 59.325 | 2015 | 59.173 | 2014 | 58.708 | 2013 | 58.544 | 2012 | 58.028 | 2011 | 57.844 | 2010 | 57.225 | 2009 | 56.699 | 2008 | 56.526 | 2007 | 56.111 | 2006 | 55.856 | 2005 | 55.421 | 2004 | 54.999 | 2003 | 54.864 | 2002 | 54.471 | 2001 | 53.988 | 2000 | 53.671 | 1999 | 53.547 | 1998 | 53.058 | 1997 | 52.932 | 1996 | 52.87 | 1995 | 52.735 | 1994 | 52.745 | 1993 | 52.912 | 1992 | 52.947 | 1991 | 52.707 | 1990 | 52.746 | 1989 | 52.555 | 1988 | 52.502 | 1987 | 52.181 | 1986 | 51.944 | 1985 | 51.661 | 1984 | 51.447 | 1983 | 51.13 | 1982 | 50.739 | 1981 | 50.374 | 1980 | 50.001 | 1979 | 49.599 | 1978 | 49.034 | 1977 | 48.629 | 1976 | 48.141 | 1975 | 47.663 | 1974 | 46.965 | 1973 | 46.432 | 1972 | 45.903 | 1971 | 45.393 | 1970 | 44.95 | 1969 | 44.576 | 1968 | 44.111 | 1967 | 43.638 | 1966 | 43.167 | 1965 | 42.75 | 1964 | 42.419 | 1963 | 42.142 | 1962 | 41.874 | 1961 | 41.595 | 1960 | 41.363 |
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