Year	scale 1-100
1970	42.5347222222222
1971	42.650462962963
1972	43.0324074074074
1973	43.8888888888889
1974	44.2013888888889
1975	44.3634259259259
1976	44.5949074074074
1977	44.5949074074074
1978	45.3703703703704
1979	45.5324074074074
1980	45.7523148148148
1981	45.9490740740741
1982	46.3773148148148
1983	47.0949074074074
1984	47.5115740740741
1985	47.5694444444444
1986	47.7199074074074
1987	47.662037037037
1988	48.7268518518519
1989	48.8773148148148
1990	49.2013888888889
1991	49.5601851851852
1992	49.9884259259259
1993	50.4166666666667
1994	50.8564814814815
1995	51.6898148148148
1996	52.1875
1997	52.7893518518519
1998	53.4027777777778
1999	53.7384259259259
2000	54.0162037037037
2001	54.3055555555556
2002	54.5717592592593
2003	54.8958333333333
2004	56.099537037037
2005	57.349537037037
2006	58.3101851851852
2007	59.3981481481481
2008	60.3009259259259
2009	60.8333333333333
2010	61.2152777777778
2011	61.4699074074074
2012	62.3611111111111
2013	64.3287037037037
2014	64.6875
2015	65.8680555555556
2016	66.6782407407407
2017	67.1643518518518
2018	68.0208333333333
2019	69.1898148148148
2020	69.6412037037037
2021	70.3703703703704
2022	71.1226851851852
2023	71.6203703703704