Year	years
1960	63.93400000000001
1961	64.05741463414635
1962	64.47882926829269
1963	64.89236585365855
1964	64.78639024390243
1965	65.09417073170734
1966	65.78468292682928
1967	65.418
1968	65.63229268292683
1969	65.64109756097561
1970	66.09546341463415
1971	66.52943902439026
1972	67.11443902439025
1973	67.52739024390245
1974	68.00568292682928
1975	68.18224390243903
1976	68.45529268292684
1977	68.74673170731708
1978	68.67375609756098
1979	68.59890243902439
1980	68.79063414634147
1981	68.72521951219514
1982	68.66829268292685
1983	68.2849024390244
1984	68.37834146341463
1985	68.78080487804878
1986	68.904
1987	69.09348780487805
1988	69.51570731707318
1989	69.77078048780488
1990	70.22921951219513
1991	70.61770731707318
1992	70.8009268292683
1993	70.96556097560976
1994	71.25065853658538
1995	71.68948780487807
1996	71.48524390243902
1997	71.58436585365854
1998	71.18729268292684
1999	69.71543902439025
2000	71.5829268292683
2001	72.23414634146341
2002	72.28536585365855
2003	72.43658536585367
2004	72.6829268292683
2005	72.83414634146342
2006	73.38536585365854
2007	73.63170731707318
2008	73.88536585365853
2009	73.98536585365855
2010	74.33658536585367
2011	74.53658536585367
2012	74.83658536585368
2013	75.18536585365854
2014	75.33658536585367
2015	75.28780487804879
2016	75.68780487804878
2017	75.53902439024391
2018	75.89024390243902
2019	75.93658536585367
2020	74.47804878048781
2021	72.78048780487805
2022	75.48219512195122