Year	scale 1-100
1970	33.75
1971	33.75
1972	33.75
1973	33.75
1974	33.75
1975	51.875
1976	54.375
1977	54.375
1978	57.5
1979	57.5
1980	60.625
1981	60.625
1982	73.75
1983	73.75
1984	73.75
1985	73.75
1986	73.75
1987	73.75
1988	73.75
1989	73.75
1990	73.75
1991	73.75
1992	73.75
1993	73.75
1994	76.875
1995	79.375
1996	94.375
1997	94.375
1998	94.375
1999	94.375
2000	94.375
2001	94.375
2002	94.375
2003	94.375
2004	94.375
2005	94.375
2006	94.375
2007	97.5
2008	97.5
2009	97.5
2010	97.5
2011	97.5
2012	97.5
2013	97.5
2014	97.5
2015	97.5
2016	97.5
2017	97.5
2018	97.5
2019	97.5
2020	97.5
2021	100
2022	100
2023	100