Year	scale 1-100
1970	40
1971	40
1972	40
1973	60.625
1974	63.125
1975	66.25
1976	71.25
1977	71.25
1978	71.25
1979	71.25
1980	71.25
1981	71.25
1982	74.375
1983	74.375
1984	74.375
1985	74.375
1986	74.375
1987	74.375
1988	74.375
1989	74.375
1990	74.375
1991	74.375
1992	74.375
1993	74.375
1994	74.375
1995	74.375
1996	74.375
1997	74.375
1998	74.375
1999	76.875
2000	83.125
2001	83.125
2002	86.25
2003	86.25
2004	88.75
2005	88.75
2006	88.75
2007	88.75
2008	95
2009	95
2010	95
2011	97.5
2012	97.5
2013	97.5
2014	97.5
2015	100
2016	100
2017	100
2018	100
2019	100
2020	100
2021	100
2022	100
2023	100