Year scale 1-100 1970 55.625 1971 55 1972 58.125 1973 61.25 1974 61.25 1975 61.25 1976 61.25 1977 61.25 1978 61.25 1979 61.25 1980 61.25 1981 61.25 1982 61.25 1983 61.25 1984 61.25 1985 61.25 1986 61.25 1987 61.25 1988 61.25 1989 61.25 1990 61.25 1991 61.25 1992 61.25 1993 64.375 1994 64.375 1995 64.375 1996 64.375 1997 64.375 1998 64.375 1999 64.375 2000 66.875 2001 66.875 2002 66.875 2003 66.875 2004 66.875 2005 66.875 2006 66.875 2007 76.25 2008 76.25 2009 76.25 2010 76.25 2011 78.75 2012 78.75 2013 78.75 2014 78.75 2015 78.75 2016 78.75 2017 78.75 2018 78.75 2019 78.75 2020 78.75 2021 78.75 2022 78.75 2023 85