Year	years
1960	64.69468292682927
1961	65.5179512195122
1962	66.28575609756098
1963	66.71470731707318
1964	67.07439024390244
1965	67.51251219512196
1966	67.79700000000001
1967	68.11931707317073
1968	68.28826829268293
1969	68.68626829268293
1970	68.91312195121951
1971	69.18834146341464
1972	69.34678048780489
1973	69.73980487804879
1974	70.20134146341464
1975	70.78343902439025
1976	71.1650731707317
1977	71.37112195121954
1978	71.546756097561
1979	71.63921951219513
1980	72.19024390243904
1981	72.58780487804879
1982	72.68780487804878
1983	73.03658536585368
1984	73.29024390243903
1985	73.89024390243904
1986	74.24634146341464
1987	74.54878048780488
1988	74.69756097560976
1989	74.94634146341464
1990	75.29512195121951
1991	75.64634146341463
1992	75.94634146341464
1993	76.04634146341465
1994	76.19756097560976
1995	76.2951219512195
1996	76.59512195121953
1997	76.89756097560975
1998	77.30000000000001
1999	77.55121951219512
2000	77.95121951219514
2001	78.25121951219512
2002	78.55121951219512
2003	79.0390243902439
2004	79.49024390243902
2005	79.99024390243903
2006	80.14146341463415
2007	80.44146341463416
2008	80.79024390243903
2009	81.24146341463415
2010	81.54146341463417
2011	81.7439024390244
2012	81.99512195121952
2013	82.24634146341465
2014	82.49512195121953
2015	82.7439024390244
2016	82.84634146341465
2017	83.09512195121954
2018	83.29756097560976
2019	83.59512195121953
2020	83.5439024390244
2021	83.09268292682928
2022	82.89512195121952