Year	years
1960	68.81975609756098
1961	68.84414634146341
1962	68.57780487804878
1963	69.01268292682927
1964	69.2209756097561
1965	68.97780487804877
1966	69.47707317073171
1967	69.66658536585368
1968	69.61634146341464
1969	69.50341463414635
1970	70.17951219512196
1971	70.01756097560977
1972	70.70731707317073
1973	71.22365853658538
1974	71.1348780487805
1975	71.67365853658538
1976	71.81292682926829
1977	72.35024390243902
1978	72.89707317073173
1979	73.15536585365855
1980	73.44
1981	73.74658536585366
1982	74.29804878048782
1983	74.2009756097561
1984	74.51902439024391
1985	74.2229268292683
1986	74.56000000000002
1987	74.5919512195122
1988	74.57707317073171
1989	74.79219512195124
1990	74.81317073170732
1991	75.22756097560976
1992	75.45536585365855
1993	75.70512195121952
1994	76.39560975609756
1995	76.40951219512196
1996	76.69341463414635
1997	76.87853658536586
1998	77.09073170731708
1999	77.29121951219513
2000	77.4658536585366
2001	77.96585365853659
2002	78.11951219512196
2003	78.36829268292684
2004	78.71463414634148
2005	78.8170731707317
2006	79.21463414634147
2007	79.26341463414636
2008	79.56829268292684
2009	79.71951219512196
2010	79.87073170731709
2011	80.47073170731709
2012	80.6268292682927
2013	80.97560975609757
2014	81.18048780487807
2015	81.48048780487807
2016	81.42926829268293
2017	81.6317073170732
2018	81.73414634146343
2019	81.9829268292683
2020	81.93170731707318
2021	81.88536585365854
2022	81.1878048780488