Year	years
1960	71.13317073170732
1961	71.34609756097562
1962	71.36707317073171
1963	71.38073170731708
1964	71.77634146341464
1965	71.87219512195124
1966	72.00439024390245
1967	72.20780487804879
1968	72.35341463414635
1969	72.50146341463415
1970	72.70048780487805
1971	73.02926829268293
1972	72.9339024390244
1973	73.16268292682928
1974	73.23756097560977
1975	73.52170731707317
1976	73.85609756097561
1977	74.21560975609756
1978	74.52975609756098
1979	74.86634146341464
1980	75.10219512195124
1981	75.49780487804878
1982	75.72512195121952
1983	76.06048780487806
1984	76.3319512195122
1985	76.32731707317075
1986	76.4639024390244
1987	76.77878048780488
1988	76.85878048780488
1989	77.12487804878049
1990	77.43658536585367
1991	77.59341463414636
1992	77.83804878048781
1993	77.7048780487805
1994	77.87170731707317
1995	77.97731707317074
1996	78.22024390243904
1997	78.41243902439025
1998	78.62365853658537
1999	78.8390243902439
2000	79.16682926829269
2001	79.39804878048783
2002	79.53073170731709
2003	79.71512195121952
2004	79.99219512195123
2005	80.11268292682928
2006	80.54365853658538
2007	80.54365853658538
2008	80.72463414634147
2009	81.0660975609756
2010	81.32219512195122
2011	81.48268292682928
2012	81.66365853658537
2013	81.74487804878049
2014	81.78439024390245
2015	81.81560975609757
2016	81.92487804878051
2017	81.8329268292683
2018	81.8439024390244
2019	82.22390243902441
2020	81.66048780487806
2021	81.5870731707317
2022	81.29560975609758