Year | Value | 2021 | 187.562 | 2020 | 187.773 | 2019 | 188.001 | 2018 | 188.34 | 2017 | 188.2 | 2016 | 188.2 | 2015 | 188.1 | 2014 | 188 | 2013 | 188.1 | 2012 | 187.6 | 2011 | 197.7 | 2010 | 197.7 | 2009 | 207.7 | 2008 | 207.6 | 2007 | 207.7 | 2006 | 217.8 | 2005 | 218 | 2004 | 228.1 | 2003 | 228.6 | 2002 | 228.5 | 2001 | 227.5 | 2000 | 230 | 1999 | 230 | 1998 | 230 | 1997 | 230 | 1996 | 230 | 1995 | 230 | 1994 | 230 | 1993 | 230 | 1992 | 230 | 1991 | 230 | 1990 | 230 | 1989 | 230 | 1988 | 230 | 1987 | 230 | 1986 | 230 | 1985 | 230 | 1984 | 230 | 1983 | 230 | 1982 | 230 | 1981 | 230 | 1980 | 230 | 1979 | 230 | 1978 | 230 | 1977 | 230 | 1976 | 230 | 1975 | 240 | 1974 | 240 | 1973 | 240 | 1972 | 250 | 1971 | 250 | 1970 | 260 | 1969 | 260 | 1968 | 260 | 1967 | 260 | 1966 | 260 | 1965 | 260 | 1964 | 260 | 1963 | 260 | 1962 | 260 | 1961 | 260 |
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