Year	scale 1-100
1970	42.5
1971	42.5
1972	42.5
1973	42.5
1974	42.5
1975	42.5
1976	42.5
1977	42.5
1978	42.5
1979	42.5
1980	42.5
1981	42.5
1982	42.5
1983	42.5
1984	42.5
1985	42.5
1986	42.5
1987	42.5
1988	42.5
1989	42.5
1990	42.5
1991	42.5
1992	42.5
1993	42.5
1994	45
1995	45
1996	45
1997	45
1998	45
1999	45
2000	57.5
2001	60
2002	60
2003	60
2004	60
2005	60
2006	60
2007	62.5
2008	62.5
2009	62.5
2010	62.5
2011	62.5
2012	68.75
2013	75
2014	75
2015	77.5
2016	77.5
2017	77.5
2018	77.5
2019	77.5
2020	77.5
2021	77.5
2022	80
2023	80