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	62.5
1979	62.5
1980	65.625
1981	65.625
1982	65.625
1983	65.625
1984	65.625
1985	65.625
1986	65.625
1987	65.625
1988	65.625
1989	68.75
1990	68.75
1991	68.75
1992	68.75
1993	68.75
1994	71.875
1995	74.375
1996	76.875
1997	76.875
1998	76.875
1999	76.875
2000	79.375
2001	79.375
2002	79.375
2003	79.375
2004	91.875
2005	91.875
2006	91.875
2007	91.875
2008	95
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	100
2020	100
2021	100
2022	100
2023	100