Year	years
1960	70.81707317073172
1961	70.97317073170733
1962	70.94243902439025
1963	70.9117073170732
1964	70.8809756097561
1965	70.85024390243903
1966	70.81951219512196
1967	70.86926829268293
1968	70.91902439024392
1969	70.96878048780488
1970	71.01853658536587
1971	71.06829268292684
1972	71.45756097560977
1973	71.8468292682927
1974	72.23609756097562
1975	72.62536585365855
1976	73.01463414634148
1977	73.34439024390244
1978	73.67414634146341
1979	74.00390243902442
1980	74.33365853658536
1981	74.66341463414635
1982	74.9048780487805
1983	75.14634146341464
1984	75.3878048780488
1985	75.62926829268294
1986	75.87073170731709
1987	76.15170731707317
1988	76.43268292682929
1989	76.71365853658537
1990	76.99463414634147
1991	77.27560975609758
1992	77.37804878048782
1993	77.87804878048782
1994	77.87804878048782
1995	77.82926829268294
1996	78.07804878048782
1997	78.48048780487805
1998	78.63170731707318
1999	78.93170731707318
2000	79.23414634146343
2001	79.63414634146342
2002	79.93658536585367
2003	80.23902439024391
2004	80.49024390243903
2005	80.84146341463415
2006	81.04146341463415
2007	81.29268292682927
2008	81.39512195121952
2009	81.54390243902441
2010	81.69512195121953
2011	81.89512195121951
2012	82.04634146341463
2013	82.14878048780488
2014	82.30000000000001
2015	82.40000000000002
2016	82.4487804878049
2017	82.50000000000001
2018	82.7487804878049
2019	82.9
2020	83.2
2021	83.3
2022	83.2