Year	scale 1-100
1970	45.7039473684211
1971	45.9210526315789
1972	46.2631578947368
1973	47.1414473684211
1974	47.6118421052632
1975	48.0197368421053
1976	48.3815789473684
1977	48.7467105263158
1978	49.4407894736842
1979	49.7269736842105
1980	50.0131578947368
1981	50.4703947368421
1982	50.8486842105263
1983	51.2532894736842
1984	51.6348684210526
1985	51.9539473684211
1986	52.2763157894737
1987	52.5032894736842
1988	53.0822368421053
1989	53.3947368421053
1990	54.0197368421053
1991	54.4276315789474
1992	54.9769736842105
1993	55.5559210526316
1994	56.3190789473684
1995	57.0559210526316
1996	57.8388157894737
1997	58.6480263157895
1998	59.2072368421053
1999	59.9276315789474
2000	60.6480263157895
2001	61.1085526315789
2002	61.9605263157895
2003	62.9013157894737
2004	63.9769736842105
2005	65.0131578947368
2006	65.9276315789474
2007	66.9309210526316
2008	67.8717105263158
2009	68.8782894736842
2010	69.5427631578947
2011	70.0657894736842
2012	70.6546052631579
2013	71.4506578947368
2014	71.9243421052632
2015	72.4605263157895
2016	73.0822368421053
2017	73.6973684210526
2018	74.4013157894737
2019	75.2894736842105
2020	75.9934210526316
2021	76.6085526315789
2022	77.1184210526316
2023	77.8552631578947