Year scale 1-100 1970 31.875 1971 31.875 1972 31.875 1973 31.875 1974 31.875 1975 31.875 1976 31.875 1977 31.875 1978 31.875 1979 31.875 1980 31.875 1981 31.875 1982 31.875 1983 31.875 1984 31.875 1985 31.875 1986 31.875 1987 31.875 1988 31.875 1989 31.875 1990 31.875 1991 31.875 1992 31.875 1993 31.875 1994 31.875 1995 31.875 1996 31.875 1997 31.875 1998 31.875 1999 31.875 2000 31.875 2001 31.875 2002 38.125 2003 38.125 2004 38.125 2005 38.125 2006 38.125 2007 38.125 2008 45.625 2009 63.125 2010 63.125 2011 63.125 2012 63.125 2013 63.125 2014 63.125 2015 63.125 2016 63.125 2017 63.125 2018 63.125 2019 63.125 2020 69.375 2021 72.5 2022 72.5 2023 92.5