Year	scale 1-100
1970	37.5
1971	37.5
1972	37.5
1973	37.5
1974	37.5
1975	37.5
1976	37.5
1977	37.5
1978	37.5
1979	37.5
1980	37.5
1981	37.5
1982	37.5
1983	52.5
1984	58.75
1985	58.75
1986	58.75
1987	58.75
1988	58.75
1989	58.75
1990	58.75
1991	58.75
1992	58.75
1993	58.75
1994	58.75
1995	58.75
1996	58.75
1997	58.75
1998	58.75
1999	58.75
2000	58.75
2001	58.75
2002	58.75
2003	58.75
2004	58.75
2005	58.75
2006	58.75
2007	58.75
2008	58.75
2009	58.75
2010	58.75
2011	58.75
2012	58.75
2013	58.75
2014	58.75
2015	58.75
2016	58.75
2017	61.25
2018	61.25
2019	61.25
2020	61.25
2021	61.25
2022	61.25
2023	61.25