Year | Value | 2022 | 89.743 | 2021 | 89.622 | 2020 | 89.506 | 2019 | 89.394 | 2018 | 89.287 | 2017 | 89.186 | 2016 | 89.09 | 2015 | 88.999 | 2014 | 88.915 | 2013 | 88.835 | 2012 | 88.762 | 2011 | 88.695 | 2010 | 88.634 | 2009 | 88.579 | 2008 | 88.53 | 2007 | 88.488 | 2006 | 88.452 | 2005 | 88.422 | 2004 | 88.399 | 2003 | 88.383 | 2002 | 88.373 | 2001 | 88.369 | 2000 | 88.372 | 1999 | 88.376 | 1998 | 88.379 | 1997 | 88.382 | 1996 | 88.385 | 1995 | 88.388 | 1994 | 88.392 | 1993 | 88.395 | 1992 | 88.398 | 1991 | 88.329 | 1990 | 88.14 | 1989 | 87.949 | 1988 | 87.754 | 1987 | 87.557 | 1986 | 87.357 | 1985 | 87.155 | 1984 | 86.95 | 1983 | 86.742 | 1982 | 86.531 | 1981 | 86.317 | 1980 | 86.101 | 1979 | 85.882 | 1978 | 85.659 | 1977 | 85.434 | 1976 | 85.206 | 1975 | 84.975 | 1974 | 84.741 | 1973 | 84.504 | 1972 | 84.265 | 1971 | 84.021 | 1970 | 83.775 | 1969 | 83.526 | 1968 | 83.275 | 1967 | 83.019 | 1966 | 82.761 | 1965 | 82.5 | 1964 | 82.389 | 1963 | 82.372 | 1962 | 82.355 | 1961 | 82.337 | 1960 | 82.32 |
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