Year	scale 1-100
1970	51.3347457627119
1971	51.5995762711864
1972	52.1080508474576
1973	53.146186440678
1974	53.6334745762712
1975	54.4809322033898
1976	55.1377118644068
1977	56.2076271186441
1978	57.3199152542373
1979	57.7436440677966
1980	58.0508474576271
1981	58.6228813559322
1982	59.2902542372881
1983	59.7563559322034
1984	60.0529661016949
1985	60.625
1986	61.3241525423729
1987	61.853813559322
1988	62.2775423728814
1989	62.8177966101695
1990	63.6758474576271
1991	64.0466101694915
1992	64.5550847457627
1993	64.9576271186441
1994	65.8368644067797
1995	66.8114406779661
1996	67.7966101694915
1997	68.5805084745763
1998	69.2584745762712
1999	70.2012711864407
2000	70.9216101694915
2001	71.3983050847458
2002	72.489406779661
2003	73.9194915254237
2004	75.3283898305085
2005	75.8368644067797
2006	76.7161016949153
2007	77.5847457627119
2008	78.3262711864407
2009	79.4491525423729
2010	80.4872881355932
2011	81.271186440678
2012	81.6843220338983
2013	81.906779661017
2014	82.4258474576271
2015	82.8072033898305
2016	82.9449152542373
2017	83.3792372881356
2018	84.0572033898305
2019	85.2966101694915
2020	86.218220338983
2021	86.864406779661
2022	86.9809322033898
2023	87.3516949152542