Year | Value | 2021 | 58.892 | 2020 | 59.327 | 2019 | 59.72 | 2018 | 59.349 | 2017 | 59.109 | 2016 | 58.763 | 2015 | 58.134 | 2014 | 57.886 | 2013 | 57.791 | 2012 | 57.406 | 2011 | 57.019 | 2010 | 56.72 | 2009 | 56.348 | 2008 | 56.044 | 2007 | 55.553 | 2006 | 55.108 | 2005 | 54.632 | 2004 | 54.117 | 2003 | 53.678 | 2002 | 53.278 | 2001 | 52.662 | 2000 | 52.479 | 1999 | 52.356 | 1998 | 52.049 | 1997 | 51.356 | 1996 | 50.544 | 1995 | 49.866 | 1994 | 49.171 | 1993 | 48.962 | 1992 | 48.363 | 1991 | 47.546 | 1990 | 47.004 | 1989 | 46.847 | 1988 | 46.589 | 1987 | 46.417 | 1986 | 45.918 | 1985 | 45.522 | 1984 | 44.946 | 1983 | 44.382 | 1982 | 43.925 | 1981 | 43.324 | 1980 | 42.884 | 1979 | 42.393 | 1978 | 41.901 | 1977 | 41.411 | 1976 | 41.024 | 1975 | 40.591 | 1974 | 40.137 | 1973 | 39.891 | 1972 | 39.673 | 1971 | 39.308 | 1970 | 39.008 | 1969 | 38.723 | 1968 | 38.559 | 1967 | 38.123 | 1966 | 37.84 | 1965 | 37.599 | 1964 | 37.341 | 1963 | 37.164 | 1962 | 36.913 | 1961 | 36.75 | 1960 | 36.547 |
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