Year	scale 1-100
1970	53.125
1971	55.625
1972	55
1973	55
1974	55
1975	55
1976	55
1977	55
1978	55
1979	55
1980	55
1981	55
1982	55
1983	55
1984	55
1985	55
1986	55
1987	55
1988	55
1989	55
1990	55
1991	55
1992	55
1993	55
1994	55
1995	55
1996	55
1997	67.5
1998	67.5
1999	67.5
2000	67.5
2001	67.5
2002	70.625
2003	88.125
2004	94.375
2005	94.375
2006	94.375
2007	94.375
2008	97.5
2009	97.5
2010	97.5
2011	97.5
2012	97.5
2013	97.5
2014	100
2015	100
2016	100
2017	100
2018	100
2019	100
2020	100
2021	100
2022	100
2023	100