Year	scale 1-100
1970	52.5
1971	52.5
1972	52.5
1973	52.5
1974	52.5
1975	52.5
1976	52.5
1977	52.5
1978	52.5
1979	52.5
1980	52.5
1981	52.5
1982	52.5
1983	52.5
1984	52.5
1985	52.5
1986	52.5
1987	52.5
1988	52.5
1989	52.5
1990	52.5
1991	52.5
1992	52.5
1993	52.5
1994	66.25
1995	66.25
1996	66.25
1997	78.125
1998	78.125
1999	78.125
2000	78.125
2001	78.125
2002	78.125
2003	78.125
2004	78.125
2005	78.125
2006	81.25
2007	81.25
2008	83.75
2009	83.75
2010	83.75
2011	83.75
2012	83.75
2013	83.75
2014	86.25
2015	86.25
2016	88.75
2017	88.75
2018	88.75
2019	88.75
2020	88.75
2021	88.75
2022	88.75
2023	88.75