Year	scale 1-100
1970	49.375
1971	49.375
1972	49.375
1973	49.375
1974	49.375
1975	49.375
1976	49.375
1977	49.375
1978	49.375
1979	49.375
1980	49.375
1981	49.375
1982	49.375
1983	49.375
1984	49.375
1985	49.375
1986	49.375
1987	49.375
1988	52.5
1989	52.5
1990	52.5
1991	52.5
1992	52.5
1993	52.5
1994	52.5
1995	57.5
1996	57.5
1997	57.5
1998	63.75
1999	63.75
2000	63.75
2001	63.75
2002	63.75
2003	63.75
2004	63.75
2005	63.75
2006	66.25
2007	66.25
2008	66.25
2009	66.25
2010	66.25
2011	66.25
2012	66.25
2013	66.25
2014	66.25
2015	66.25
2016	66.25
2017	68.75
2018	71.875
2019	71.875
2020	74.375
2021	74.375
2022	74.375
2023	74.375