Year | Value | 2021 | 81 | 2020 | 81 | 2019 | 81 | 2018 | 81 | 2017 | 81.1 | 2016 | 82.2 | 2015 | 83.2 | 2014 | 84.3 | 2013 | 85.3 | 2012 | 86.4 | 2011 | 87.4 | 2010 | 88.5 | 2009 | 89.5 | 2008 | 90.6 | 2007 | 91.6 | 2006 | 92.7 | 2005 | 93.7 | 2004 | 94.8 | 2003 | 95.8 | 2002 | 96.9 | 2001 | 97.9 | 2000 | 99 | 1999 | 100 | 1998 | 100 | 1997 | 100 | 1996 | 100 | 1995 | 100 | 1994 | 100 | 1993 | 100 | 1992 | 100 | 1991 | 100 | 1990 | 100 | 1989 | 100 | 1988 | 100 | 1987 | 100 | 1986 | 100 | 1985 | 100 | 1984 | 100 | 1983 | 100 | 1982 | 100 | 1981 | 100 | 1980 | 100 | 1979 | 100 | 1978 | 100 | 1977 | 100 | 1976 | 100 | 1975 | 100 | 1974 | 100 | 1973 | 100 | 1972 | 100 | 1971 | 100 | 1970 | 100 | 1969 | 100 | 1968 | 100 | 1967 | 100 | 1966 | 100 | 1965 | 100 | 1964 | 100 | 1963 | 100 | 1962 | 100 | 1961 | 100 |
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