Year	scale 1-100
1970	60
1971	60
1972	60
1973	60
1974	60
1975	60
1976	60
1977	62.5
1978	62.5
1979	62.5
1980	65.625
1981	65.625
1982	68.125
1983	68.125
1984	68.125
1985	68.125
1986	68.125
1987	68.125
1988	68.125
1989	68.125
1990	68.125
1991	68.125
1992	70.625
1993	70.625
1994	70.625
1995	70.625
1996	70.625
1997	70.625
1998	70.625
1999	70.625
2000	70.625
2001	70.625
2002	70.625
2003	70.625
2004	70.625
2005	70.625
2006	70.625
2007	70.625
2008	70.625
2009	70.625
2010	70.625
2011	70.625
2012	70.625
2013	70.625
2014	70.625
2015	70.625
2016	70.625
2017	70.625
2018	76.875
2019	76.875
2020	80
2021	80
2022	80
2023	80