Year	years
1960	68.97804878048781
1961	68.97804878048781
1962	68.97804878048781
1963	68.62195121951221
1964	68.66341463414635
1965	68.3658536585366
1966	69.01219512195124
1967	69.36585365853658
1968	68.91707317073171
1969	68.3609756097561
1970	68.60975609756099
1971	68.83414634146342
1972	69.05853658536587
1973	69.40487804878049
1974	70.1609756097561
1975	70.35853658536587
1976	70.30731707317074
1977	70.55609756097562
1978	70.70243902439024
1979	70.85365853658537
1980	71.10487804878049
1981	71.2048780487805
1982	71.05365853658537
1983	70.54146341463417
1984	70.90243902439026
1985	71.35121951219513
1986	71.80243902439027
1987	72.00243902439024
1988	72.44634146341464
1989	72.7048780487805
1990	73.20487804878049
1991	73.35365853658537
1992	73.3048780487805
1993	73.25365853658538
1994	73.4048780487805
1995	73.95853658536586
1996	74.45853658536585
1997	74.70731707317073
1998	74.80731707317075
1999	75.00975609756098
2000	75.41219512195123
2001	75.75853658536586
2002	76.00731707317074
2003	76.85853658536585
2004	77.20731707317073
2005	77.61219512195122
2006	78.08658536585367
2007	78.56097560975611
2008	78.7658536585366
2009	78.97073170731707
2010	79.4219512195122
2011	79.97073170731709
2012	80.12439024390244
2013	80.3219512195122
2014	81.0780487804878
2015	80.77560975609757
2016	81.17560975609757
2017	81.02926829268294
2018	81.3780487804878
2019	81.52926829268293
2020	80.53170731707318
2021	80.67560975609756
2022	81.28292682926829