Year scale 1-100 1970 38.125 1971 38.125 1972 38.125 1973 38.125 1974 38.125 1975 38.125 1976 38.125 1977 38.125 1978 38.125 1979 38.125 1980 38.125 1981 38.125 1982 38.125 1983 38.125 1984 38.125 1985 38.125 1986 38.125 1987 38.125 1988 38.125 1989 38.125 1990 38.125 1991 38.125 1992 38.125 1993 38.125 1994 41.25 1995 41.25 1996 44.375 1997 44.375 1998 44.375 1999 44.375 2000 44.375 2001 44.375 2002 44.375 2003 44.375 2004 70.625 2005 73.125 2006 73.125 2007 73.125 2008 73.125 2009 73.125 2010 73.125 2011 73.125 2012 73.125 2013 73.125 2014 73.125 2015 73.125 2016 73.125 2017 73.125 2018 75.625 2019 75.625 2020 75.625 2021 75.625 2022 75.625 2023 75.625