Year	scale 1-100
1970	36.25
1971	36.25
1972	36.25
1973	38.75
1974	38.75
1975	38.75
1976	38.75
1977	38.75
1978	38.75
1979	38.75
1980	38.75
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	47.5
1998	47.5
1999	47.5
2000	47.5
2001	47.5
2002	47.5
2003	47.5
2004	53.75
2005	53.75
2006	53.75
2007	53.75
2008	53.75
2009	53.75
2010	53.75
2011	53.75
2012	53.75
2013	53.75
2014	53.75
2015	53.75
2016	53.75
2017	53.75
2018	56.875
2019	56.875
2020	56.875
2021	56.875
2022	53.75
2023	53.75