Year	scale 1-100
1970	47.8515625
1971	48.59375
1972	49.2578125
1973	50.37109375
1974	50.80078125
1975	51.40625
1976	51.97265625
1977	52.3828125
1978	52.63671875
1979	53.28125
1980	53.53515625
1981	54.609375
1982	55.05859375
1983	55.9375
1984	56.62109375
1985	57.2265625
1986	57.40234375
1987	57.48046875
1988	58.6328125
1989	59.2578125
1990	60.41015625
1991	60.859375
1992	61.81640625
1993	62.40234375
1994	63.75
1995	64.4921875
1996	65.15625
1997	66.85546875
1998	67.6953125
1999	68.69140625
2000	69.8828125
2001	70.68359375
2002	71.93359375
2003	72.40234375
2004	72.734375
2005	72.83203125
2006	73.37890625
2007	73.92578125
2008	74.70703125
2009	75.33203125
2010	75.60546875
2011	75.60546875
2012	75.859375
2013	76.71875
2014	77.24609375
2015	78.22265625
2016	78.61328125
2017	78.9453125
2018	79.3359375
2019	79.62890625
2020	80.234375
2021	80.41015625
2022	80.6640625
2023	81.15234375