Year	years
1960	69.30000000000001
1961	70.31585365853658
1962	70.2549756097561
1963	70.61053658536586
1964	70.56939024390246
1965	71.42831707317073
1966	71.75270731707317
1967	71.29878048780489
1968	71.43019512195121
1969	72.00434146341465
1970	72.77080487804878
1971	73.00956097560976
1972	72.78268292682927
1973	72.9819756097561
1974	73.41558536585367
1975	73.37636585365856
1976	73.63400000000001
1977	73.67080487804878
1978	74.35875609756098
1979	74.62107317073172
1980	74.54626829268294
1981	74.95743902439024
1982	75.25053658536586
1983	75.51773170731708
1984	75.77439024390245
1985	76.08290243902441
1986	76.48265853658536
1987	76.27985365853658
1988	76.98075609756097
1989	76.6878048780488
1990	76.93902439024392
1991	77.13658536585366
1992	77.3829268292683
1993	77.39024390243904
1994	77.63902439024392
1995	77.58536585365854
1996	77.68536585365854
1997	78.13658536585366
1998	77.83902439024392
1999	77.98780487804879
2000	77.8878048780488
2001	78.38780487804878
2002	78.64146341463415
2003	78.84146341463415
2004	79.0390243902439
2005	79.23902439024391
2006	79.43902439024392
2007	79.43902439024392
2008	79.93902439024392
2009	80.18780487804878
2010	80.3878048780488
2011	80.73170731707317
2012	80.63414634146342
2013	81.28536585365853
2014	81.38536585365853
2015	81.03658536585367
2016	81.3878048780488
2017	81.28780487804877
2018	81.7878048780488
2019	81.63902439024392
2020	81.28780487804877
2021	80.0829268292683
2022	80.63658536585366