Year	scale 1-100
1970	53.75
1971	56.25
1972	56.25
1973	59.375
1974	59.375
1975	59.375
1976	62.5
1977	62.5
1978	62.5
1979	62.5
1980	62.5
1981	62.5
1982	62.5
1983	65.625
1984	65.625
1985	65.625
1986	70.625
1987	73.75
1988	76.875
1989	76.875
1990	76.875
1991	76.875
1992	76.875
1993	86.25
1994	86.25
1995	86.25
1996	86.25
1997	86.25
1998	86.25
1999	86.25
2000	86.25
2001	89.375
2002	89.375
2003	89.375
2004	91.875
2005	91.875
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	100
2018	100
2019	100
2020	100
2021	100
2022	100
2023	100