Year scale 1-100 1970 50.625 1971 50.625 1972 50.625 1973 50.625 1974 50.625 1975 50.625 1976 50.625 1977 50.625 1978 50.625 1979 50.625 1980 50.625 1981 50.625 1982 50.625 1983 50.625 1984 50.625 1985 50.625 1986 50.625 1987 50.625 1988 50.625 1989 50.625 1990 50.625 1991 50.625 1992 50.625 1993 50 1994 50 1995 50 1996 50 1997 50 1998 50 1999 50 2000 50 2001 63.125 2002 63.125 2003 63.125 2004 63.125 2005 65.625 2006 65.625 2007 65.625 2008 65.625 2009 65.625 2010 65.625 2011 65.625 2012 71.875 2013 71.875 2014 71.875 2015 71.875 2016 71.875 2017 71.875 2018 71.875 2019 71.875 2020 80 2021 80 2022 80 2023 80