Year	years
1960	64.00746341463416
1961	62.66651219512196
1962	64.1810243902439
1963	64.78839024390244
1964	64.98339024390245
1965	65.96046341463415
1966	65.48765853658539
1967	66.33407317073171
1968	66.67819512195122
1969	66.27817073170732
1970	67.07317073170732
1971	66.77073170731708
1972	68.32439024390244
1973	67.52439024390245
1974	68.01951219512196
1975	68.30975609756098
1976	68.8609756097561
1977	70.01219512195122
1978	70.31707317073172
1979	71.16829268292685
1980	71.21463414634147
1981	71.61463414634147
1982	72.41463414634147
1983	72.2658536585366
1984	72.51463414634145
1985	72.81463414634148
1986	73.26585365853659
1987	73.66585365853659
1988	73.71463414634147
1989	74.2658536585366
1990	73.96585365853659
1991	74.01463414634146
1992	74.31219512195123
1993	74.51219512195122
1994	74.91463414634147
1995	75.31219512195122
1996	75.26097560975612
1997	75.41219512195123
1998	75.71219512195123
1999	75.96341463414635
2000	76.31463414634148
2001	76.81463414634149
2002	77.0658536585366
2003	77.21951219512196
2004	77.67073170731709
2005	78.0707317073171
2006	78.41951219512195
2007	78.3219512195122
2008	78.52439024390246
2009	78.72682926829269
2010	79.02682926829269
2011	80.47073170731709
2012	80.37317073170732
2013	80.7219512195122
2014	81.12195121951221
2015	81.12439024390245
2016	81.12439024390245
2017	81.42439024390245
2018	81.32439024390244
2019	81.67560975609757
2020	80.97560975609757
2021	81.3780487804878
2022	81.58048780487806