Year	scale 1-100
1970	41.25
1971	41.25
1972	43.75
1973	43.75
1974	43.75
1975	43.75
1976	43.75
1977	64.375
1978	64.375
1979	64.375
1980	64.375
1981	64.375
1982	64.375
1983	64.375
1984	64.375
1985	64.375
1986	64.375
1987	64.375
1988	64.375
1989	64.375
1990	64.375
1991	64.375
1992	64.375
1993	64.375
1994	64.375
1995	66.875
1996	66.875
1997	70
1998	72.5
1999	75.625
2000	75.625
2001	75.625
2002	75.625
2003	84.375
2004	84.375
2005	84.375
2006	84.375
2007	87.5
2008	87.5
2009	93.75
2010	100
2011	100
2012	100
2013	100
2014	100
2015	100
2016	100
2017	100
2018	100
2019	100
2020	100
2021	100
2022	100
2023	100