Year	scale 1-100
1970	71.25
1971	71.25
1972	71.25
1973	71.25
1974	73.75
1975	73.75
1976	73.75
1977	73.75
1978	73.75
1979	73.75
1980	79.375
1981	79.375
1982	79.375
1983	79.375
1984	79.375
1985	79.375
1986	79.375
1987	79.375
1988	79.375
1989	81.875
1990	81.875
1991	85
1992	87.5
1993	87.5
1994	87.5
1995	87.5
1996	87.5
1997	87.5
1998	87.5
1999	90.625
2000	90.625
2001	90.625
2002	90.625
2003	90.625
2004	90.625
2005	90.625
2006	96.875
2007	96.875
2008	96.875
2009	96.875
2010	96.875
2011	96.875
2012	96.875
2013	100
2014	100
2015	100
2016	100
2017	100
2018	100
2019	100
2020	100
2021	100
2022	100
2023	100