Year	scale 1-100
1970	55
1971	55
1972	55
1973	55
1974	55
1975	58.125
1976	58.125
1977	60.625
1978	63.75
1979	63.75
1980	63.75
1981	66.25
1982	68.75
1983	71.875
1984	71.875
1985	71.875
1986	71.875
1987	75
1988	75
1989	75
1990	75
1991	75
1992	75
1993	75
1994	78.125
1995	78.125
1996	83.125
1997	85.625
1998	85.625
1999	91.875
2000	95
2001	95
2002	95
2003	95
2004	95
2005	95
2006	95
2007	95
2008	95
2009	95
2010	95
2011	95
2012	95
2013	95
2014	95
2015	95
2016	95
2017	97.5
2018	97.5
2019	97.5
2020	100
2021	100
2022	100
2023	100