Year	scale 1-100
1970	17.5
1971	17.5
1972	17.5
1973	17.5
1974	17.5
1975	17.5
1976	17.5
1977	17.5
1978	17.5
1979	17.5
1980	17.5
1981	17.5
1982	17.5
1983	17.5
1984	17.5
1985	17.5
1986	17.5
1987	17.5
1988	17.5
1989	17.5
1990	17.5
1991	23.75
1992	23.75
1993	23.75
1994	23.75
1995	23.75
1996	23.75
1997	26.25
1998	26.25
1999	26.25
2000	26.25
2001	26.25
2002	26.25
2003	26.25
2004	26.25
2005	26.25
2006	26.25
2007	26.25
2008	26.25
2009	29.375
2010	29.375
2011	29.375
2012	29.375
2013	29.375
2014	29.375
2015	29.375
2016	29.375
2017	29.375
2018	29.375
2019	29.375
2020	32.5
2021	32.5
2022	32.5
2023	32.5