Year	years
1960	68.59253658536586
1961	69.2668292682927
1962	68.10517073170732
1963	68.7219268292683
1964	69.39168292682928
1965	69.02541463414636
1966	69.17563414634147
1967	69.23402439024392
1968	69.66243902439025
1969	69.48070731707318
1970	69.59321951219515
1971	69.19524390243903
1972	70.32158536585368
1973	70.24036585365855
1974	70.15717073170732
1975	70.29860975609758
1976	69.97514634146341
1977	71.45865853658538
1978	71.49580487804879
1979	72.33078048780489
1980	72.2068048780488
1981	72.36975609756098
1982	72.65034146341463
1983	72.78112195121952
1984	73.05321951219513
1985	73.53419512195123
1986	73.99551219512196
1987	74.07609756097561
1988	74.78821951219514
1989	74.56626829268295
1990	75.43831707317074
1991	75.46341463414635
1992	75.77073170731707
1993	75.71219512195123
1994	76.37073170731708
1995	76.51219512195124
1996	76.51951219512196
1997	76.88048780487804
1998	77.0170731707317
1999	77.77073170731708
2000	77.87317073170732
2001	77.82439024390246
2002	77.96585365853659
2003	77.72682926829269
2004	79.1219512195122
2005	79.43170731707318
2006	79.2878048780488
2007	79.3829268292683
2008	80.53902439024391
2009	80.63658536585366
2010	80.63170731707318
2011	80.98780487804878
2012	81.39268292682927
2013	81.80000000000001
2014	82.22926829268293
2015	82.29268292682927
2016	82.68536585365854
2017	82.09512195121953
2018	82.29512195121951
2019	82.63902439024392
2020	82.1439024390244
2021	82.59756097560975
2022	83.04634146341465