Year	scale 1-100
1970	26.875
1971	26.875
1972	26.875
1973	26.875
1974	26.875
1975	33.125
1976	33.125
1977	33.125
1978	33.125
1979	33.125
1980	33.125
1981	38.75
1982	38.75
1983	38.75
1984	38.75
1985	38.75
1986	38.75
1987	38.75
1988	38.75
1989	38.75
1990	38.75
1991	38.75
1992	38.75
1993	38.75
1994	38.75
1995	38.75
1996	38.75
1997	38.75
1998	38.75
1999	38.75
2000	38.75
2001	38.75
2002	38.75
2003	38.75
2004	38.75
2005	38.75
2006	38.75
2007	38.75
2008	38.75
2009	38.75
2010	38.75
2011	38.75
2012	38.75
2013	43.75
2014	43.75
2015	43.75
2016	43.75
2017	43.75
2018	43.75
2019	46.25
2020	46.25
2021	46.25
2022	46.25
2023	46.25