Year scale 1-100 1970 39.375 1971 39.375 1972 39.375 1973 39.375 1974 39.375 1975 39.375 1976 39.375 1977 39.375 1978 39.375 1979 39.375 1980 39.375 1981 39.375 1982 39.375 1983 39.375 1984 39.375 1985 39.375 1986 39.375 1987 39.375 1988 39.375 1989 39.375 1990 39.375 1991 39.375 1992 39.375 1993 39.375 1994 39.375 1995 39.375 1996 39.375 1997 39.375 1998 39.375 1999 39.375 2000 39.375 2001 39.375 2002 44.375 2003 44.375 2004 44.375 2005 44.375 2006 44.375 2007 46.875 2008 46.875 2009 49.375 2010 49.375 2011 49.375 2012 49.375 2013 49.375 2014 49.375 2015 55.625 2016 55.625 2017 55.625 2018 71.875 2019 80.625 2020 80.625 2021 80.625 2022 80.625 2023 80.625