Year scale 1-100 1970 41.25 1971 41.25 1972 41.25 1973 41.25 1974 41.25 1975 41.25 1976 41.25 1977 41.25 1978 41.25 1979 41.25 1980 41.25 1981 41.25 1982 41.25 1983 41.25 1984 41.25 1985 41.25 1986 41.25 1987 41.25 1988 41.25 1989 41.25 1990 41.25 1991 41.25 1992 41.25 1993 46.25 1994 46.25 1995 46.25 1996 46.25 1997 46.25 1998 46.25 1999 46.25 2000 49.375 2001 49.375 2002 49.375 2003 49.375 2004 49.375 2005 49.375 2006 49.375 2007 49.375 2008 49.375 2009 49.375 2010 49.375 2011 49.375 2012 54.375 2013 54.375 2014 54.375 2015 54.375 2016 54.375 2017 54.375 2018 63.75 2019 63.75 2020 63.75 2021 63.75 2022 63.75 2023 63.75