Year	years
1960	69.77073170731707
1961	70.27073170731708
1962	70.11951219512196
1963	69.91707317073171
1964	70.16585365853659
1965	70.21463414634147
1966	70.21219512195123
1967	70.56097560975611
1968	69.95121951219512
1969	70.50731707317075
1970	70.80731707317074
1971	71.10731707317075
1972	71.15609756097562
1973	71.35609756097561
1974	71.9560975609756
1975	72.60487804878048
1976	72.85609756097561
1977	73.25609756097562
1978	73.35609756097561
1979	73.8048780487805
1980	73.60975609756099
1981	74.009756097561
1982	74.3609756097561
1983	74.46341463414633
1984	74.56341463414635
1985	74.56341463414635
1986	74.61463414634147
1987	74.7658536585366
1988	74.7658536585366
1989	75.01707317073172
1990	75.21463414634147
1991	75.3658536585366
1992	75.6170731707317
1993	75.41951219512197
1994	75.61951219512196
1995	75.6219512195122
1996	76.02682926829269
1997	76.42926829268293
1998	76.58048780487806
1999	76.5829268292683
2000	76.63658536585366
2001	76.83658536585367
2002	76.93658536585366
2003	77.03658536585367
2004	77.48780487804878
2005	77.48780487804878
2006	77.68780487804878
2007	77.98780487804879
2008	78.03902439024391
2009	78.39024390243902
2010	78.54146341463415
2011	78.64146341463415
2012	78.74146341463415
2013	78.74146341463415
2014	78.84146341463415
2015	78.69024390243904
2016	78.53902439024391
2017	78.53902439024391
2018	78.63902439024392
2019	78.78780487804877
2020	76.98048780487805
2021	76.32926829268293
2022	77.43414634146343