Year | Value | 2021 | 77.53 | 2020 | 78.414 | 2019 | 79.22 | 2018 | 79.093 | 2017 | 78.958 | 2016 | 78.768 | 2015 | 78.112 | 2014 | 77.709 | 2013 | 78.624 | 2012 | 79.867 | 2011 | 79.382 | 2010 | 79.652 | 2009 | 79.726 | 2008 | 79.607 | 2007 | 78.953 | 2006 | 79.141 | 2005 | 78.332 | 2004 | 78.692 | 2003 | 78.55 | 2002 | 76.83 | 2001 | 77.988 | 2000 | 77.311 | 1999 | 77.871 | 1998 | 76.386 | 1997 | 76.393 | 1996 | 76.205 | 1995 | 74.331 | 1994 | 75.222 | 1993 | 64.383 | 1992 | 64.254 | 1991 | 75.314 | 1990 | 75.4 | 1989 | 74.428 | 1988 | 74.465 | 1987 | 74.252 | 1986 | 74.144 | 1985 | 73.511 | 1984 | 74.13 | 1983 | 74.526 | 1982 | 74.246 | 1981 | 74.04 | 1980 | 73.889 | 1979 | 73.537 | 1978 | 73.357 | 1977 | 73.219 | 1976 | 72.733 | 1975 | 72.457 | 1974 | 71.857 | 1973 | 71.19 | 1972 | 70.761 | 1971 | 70.168 | 1970 | 69.64 | 1969 | 69.079 | 1968 | 68.654 | 1967 | 68.23 | 1966 | 67.773 | 1965 | 67.164 | 1964 | 66.579 | 1963 | 65.845 | 1962 | 65.113 | 1961 | 64.445 | 1960 | 63.693 |
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