Year	years
1960	65.48236585365855
1961	66.18034146341463
1962	66.46914634146343
1963	66.85580487804879
1964	67.29231707317074
1965	67.83256097560975
1966	68.12143902439026
1967	68.2989512195122
1968	68.38641463414636
1969	68.66029268292684
1970	68.81263414634147
1971	69.14017073170731
1972	69.44178048780489
1973	69.84848780487805
1974	70.14365853658538
1975	70.00195121951221
1976	70.45536585365853
1977	70.74439024390244
1978	70.53878048780489
1979	70.42731707317074
1980	70.17536585365856
1981	70.34439024390245
1982	70.48268292682928
1983	70.2748780487805
1984	70.21853658536585
1985	70.88609756097561
1986	71.4190243902439
1987	71.47024390243904
1988	71.48829268292683
1989	71.84463414634146
1990	72.17048780487805
1991	72.18536585365855
1992	71.24146341463415
1993	71.52243902439025
1994	71.80341463414635
1995	72.08439024390245
1996	72.36536585365855
1997	72.49512195121952
1998	72.31707317073172
1999	72.6419512195122
2000	72.8078048780488
2001	74.51292682926831
2002	74.71731707317075
2003	74.6139024390244
2004	75.52024390243902
2005	75.24463414634147
2006	75.8368292682927
2007	75.70560975609757
2008	75.91219512195123
2009	76.16829268292685
2010	76.47560975609755
2011	76.77560975609757
2012	76.92439024390244
2013	77.1268292682927
2014	77.47804878048781
2015	77.27560975609758
2016	78.0219512195122
2017	77.8268292682927
2018	78.0707317073171
2019	78.42439024390245
2020	77.72439024390245
2021	76.42439024390245
2022	77.57560975609756