Year | Value | 2022 | 76.783 | 2021 | 76.932 | 2020 | 77.067 | 2019 | 77.188 | 2018 | 77.297 | 2017 | 77.392 | 2016 | 77.474 | 2015 | 77.544 | 2014 | 77.601 | 2013 | 77.645 | 2012 | 77.676 | 2011 | 77.695 | 2010 | 77.702 | 2009 | 77.695 | 2008 | 77.689 | 2007 | 77.683 | 2006 | 77.676 | 2005 | 77.67 | 2004 | 77.67 | 2003 | 77.67 | 2002 | 77.67 | 2001 | 77.67 | 2000 | 77.67 | 1999 | 77.251 | 1998 | 76.686 | 1997 | 76.111 | 1996 | 75.527 | 1995 | 74.932 | 1994 | 74.446 | 1993 | 74.38 | 1992 | 74.314 | 1991 | 74.248 | 1990 | 74.182 | 1989 | 74.116 | 1988 | 74.05 | 1987 | 73.984 | 1986 | 73.917 | 1985 | 73.851 | 1984 | 73.784 | 1983 | 73.717 | 1982 | 73.65 | 1981 | 73.583 | 1980 | 73.555 | 1979 | 73.673 | 1978 | 73.791 | 1977 | 73.908 | 1976 | 74.025 | 1975 | 74.142 | 1974 | 74.259 | 1973 | 74.407 | 1972 | 74.67 | 1971 | 74.932 | 1970 | 75.192 | 1969 | 75.449 | 1968 | 75.705 | 1967 | 75.96 | 1966 | 76.212 | 1965 | 76.463 | 1964 | 76.711 | 1963 | 76.958 | 1962 | 77.203 | 1961 | 77.447 | 1960 | 77.688 |
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