Year | Value | 2021 | 59.458 | 2020 | 62.178 | 2019 | 62.834 | 2018 | 62.203 | 2017 | 61.954 | 2016 | 61.307 | 2015 | 60.709 | 2014 | 60.062 | 2013 | 59.352 | 2012 | 58.775 | 2011 | 57.731 | 2010 | 56.067 | 2009 | 54.728 | 2008 | 53.488 | 2007 | 52.691 | 2006 | 52.209 | 2005 | 52.064 | 2004 | 51.891 | 2003 | 51.97 | 2002 | 53.191 | 2001 | 54.565 | 2000 | 55.397 | 1999 | 55.991 | 1998 | 56.624 | 1997 | 57.276 | 1996 | 57.762 | 1995 | 58.441 | 1994 | 58.777 | 1993 | 59.103 | 1992 | 59.534 | 1991 | 59.506 | 1990 | 59.93 | 1989 | 60.143 | 1988 | 60.115 | 1987 | 60.011 | 1986 | 59.796 | 1985 | 59.451 | 1984 | 59.023 | 1983 | 58.516 | 1982 | 58.006 | 1981 | 57.413 | 1980 | 56.891 | 1979 | 56.457 | 1978 | 56.055 | 1977 | 55.623 | 1976 | 55.215 | 1975 | 54.77 | 1974 | 54.443 | 1973 | 54.119 | 1972 | 53.701 | 1971 | 53.449 | 1970 | 53.146 | 1969 | 52.811 | 1968 | 52.557 | 1967 | 52.35 | 1966 | 52.223 | 1965 | 52.123 | 1964 | 51.889 | 1963 | 51.656 | 1962 | 51.45 | 1961 | 51.206 | 1960 | 50.877 |
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