Year	years
1960	68.58560975609757
1961	69.57731707317075
1962	69.30951219512197
1963	69.44365853658539
1964	69.92195121951221
1965	69.72219512195122
1966	70.04585365853659
1967	69.91780487804878
1968	70.05756097560976
1969	69.83317073170733
1970	69.91463414634147
1971	70.11463414634147
1972	70.46341463414635
1973	71.01463414634146
1974	71.01219512195122
1975	71.11463414634149
1976	71.56585365853658
1977	71.91463414634147
1978	72.01219512195122
1979	72.31219512195123
1980	72.46341463414635
1981	72.81219512195122
1982	72.9609756097561
1983	73.01219512195124
1984	73.61219512195123
1985	73.81463414634148
1986	74.31707317073172
1987	74.76829268292684
1988	75.21707317073171
1989	75.2658536585366
1990	75.56829268292685
1991	75.6170731707317
1992	75.81707317073172
1993	76.06829268292684
1994	76.41951219512195
1995	76.66829268292685
1996	76.87073170731708
1997	77.31951219512196
1998	77.67073170731709
1999	77.87560975609757
2000	78.1268292682927
2001	78.57560975609756
2002	78.67804878048783
2003	78.63170731707318
2004	79.18048780487806
2005	79.33170731707318
2006	79.88048780487806
2007	80.18048780487806
2008	80.43170731707318
2009	80.33170731707318
2010	80.58048780487806
2011	80.9829268292683
2012	80.93658536585367
2013	81.13658536585366
2014	81.49024390243903
2015	81.19024390243904
2016	81.64146341463416
2017	81.6439024390244
2018	81.69268292682928
2019	81.89512195121951
2020	81.19268292682928
2021	81.19024390243904
2022	81.09268292682928