Year	scale 1-100
1970	51.875
1971	51.875
1972	51.875
1973	51.875
1974	51.875
1975	51.875
1976	51.875
1977	51.875
1978	51.875
1979	51.875
1980	51.875
1981	51.875
1982	51.875
1983	51.875
1984	51.875
1985	51.875
1986	51.875
1987	51.875
1988	51.875
1989	51.875
1990	54.375
1991	54.375
1992	54.375
1993	54.375
1994	56.875
1995	56.875
1996	56.875
1997	66.25
1998	66.25
1999	66.25
2000	66.25
2001	66.25
2002	66.25
2003	66.25
2004	66.25
2005	66.25
2006	68.75
2007	68.75
2008	68.75
2009	68.75
2010	75
2011	75
2012	75
2013	75
2014	75
2015	75
2016	75
2017	75
2018	75
2019	75
2020	75
2021	81.25
2022	81.25
2023	81.25