Year | Value | 2021 | 70.312 | 2020 | 70.341 | 2019 | 69.767 | 2018 | 70.211 | 2017 | 70.158 | 2016 | 70.107 | 2015 | 70.077 | 2014 | 70.015 | 2013 | 69.916 | 2012 | 69.709 | 2011 | 69.77 | 2010 | 69.702 | 2009 | 67.844 | 2008 | 69.55 | 2007 | 69.481 | 2006 | 69.385 | 2005 | 69.136 | 2004 | 69.036 | 2003 | 68.845 | 2002 | 68.615 | 2001 | 68.349 | 2000 | 68.063 | 1999 | 67.76 | 1998 | 67.461 | 1997 | 67.146 | 1996 | 66.85 | 1995 | 66.552 | 1994 | 66.204 | 1993 | 65.929 | 1992 | 65.605 | 1991 | 65.141 | 1990 | 64.894 | 1989 | 64.648 | 1988 | 64.363 | 1987 | 64.051 | 1986 | 63.778 | 1985 | 63.461 | 1984 | 63.139 | 1983 | 62.764 | 1982 | 62.444 | 1981 | 62.12 | 1980 | 61.819 | 1979 | 61.513 | 1978 | 61.187 | 1977 | 60.953 | 1976 | 60.616 | 1975 | 60.262 | 1974 | 59.84 | 1973 | 59.449 | 1972 | 59.068 | 1971 | 58.66 | 1970 | 58.232 | 1969 | 57.804 | 1968 | 57.374 | 1967 | 56.964 | 1966 | 56.453 | 1965 | 56.147 | 1964 | 53.036 | 1963 | 55.319 | 1962 | 54.856 | 1961 | 54.397 | 1960 | 53.861 |
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