Year	scale 1-100
1970	62.5
1971	62.5
1972	62.5
1973	62.5
1974	62.5
1975	62.5
1976	62.5
1977	65.625
1978	65.625
1979	65.625
1980	65.625
1981	65.625
1982	65.625
1983	65.625
1984	65.625
1985	65.625
1986	71.25
1987	71.25
1988	71.25
1989	71.25
1990	71.25
1991	71.25
1992	71.25
1993	71.25
1994	71.25
1995	74.375
1996	74.375
1997	74.375
1998	76.875
1999	76.875
2000	76.875
2001	76.875
2002	79.375
2003	79.375
2004	79.375
2005	79.375
2006	81.875
2007	93.75
2008	93.75
2009	96.875
2010	96.875
2011	96.875
2012	96.875
2013	96.875
2014	96.875
2015	96.875
2016	96.875
2017	96.875
2018	100
2019	100
2020	100
2021	100
2022	100
2023	100