Year | Value | 2022 | 59.118 | 2021 | 58.786 | 2020 | 58.482 | 2019 | 58.208 | 2018 | 57.963 | 2017 | 57.748 | 2016 | 57.563 | 2015 | 57.408 | 2014 | 57.284 | 2013 | 57.189 | 2012 | 57.125 | 2011 | 57.092 | 2010 | 57.089 | 2009 | 57.117 | 2008 | 57.175 | 2007 | 57.264 | 2006 | 57.383 | 2005 | 57.532 | 2004 | 57.711 | 2003 | 57.921 | 2002 | 58.13 | 2001 | 58.339 | 2000 | 58.548 | 1999 | 58.757 | 1998 | 58.965 | 1997 | 59.172 | 1996 | 59.38 | 1995 | 59.587 | 1994 | 59.794 | 1993 | 59.291 | 1992 | 58.764 | 1991 | 58.234 | 1990 | 57.789 | 1989 | 57.373 | 1988 | 56.955 | 1987 | 56.536 | 1986 | 56.117 | 1985 | 55.696 | 1984 | 55.276 | 1983 | 54.853 | 1982 | 54.43 | 1981 | 54.007 | 1980 | 53.469 | 1979 | 52.889 | 1978 | 52.31 | 1977 | 51.73 | 1976 | 51.151 | 1975 | 50.569 | 1974 | 49.988 | 1973 | 49.407 | 1972 | 48.827 | 1971 | 48.246 | 1970 | 47.079 | 1969 | 45.718 | 1968 | 44.364 | 1967 | 43.016 | 1966 | 41.68 | 1965 | 40.355 | 1964 | 39.047 | 1963 | 37.75 | 1962 | 36.473 | 1961 | 35.214 | 1960 | 34.02 |
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