Year	years
1960	68.00317073170733
1961	68.93609756097563
1962	67.8658536585366
1963	68.87414634146343
1964	69.3809756097561
1965	69.07121951219513
1966	69.82243902439025
1967	69.4070731707317
1968	69.23024390243904
1969	69.31463414634148
1970	69.16463414634148
1971	69.05243902439025
1972	69.66463414634147
1973	69.51804878048782
1974	69.24804878048782
1975	69.29000000000002
1976	69.57317073170732
1977	69.8480487804878
1978	69.39390243902439
1979	69.61536585365855
1980	69.06170731707319
1981	69.13926829268293
1982	69.3578048780488
1983	68.97365853658538
1984	69.02585365853659
1985	68.97219512195123
1986	69.17341463414634
1987	69.65121951219513
1988	70.02341463414635
1989	69.46170731707318
1990	69.31560975609757
1991	69.37707317073172
1992	69.11707317073171
1993	69.10121951219513
1994	69.46975609756099
1995	69.79170731707318
1996	70.32878048780489
1997	70.70243902439024
1998	70.5578048780488
1999	70.6770731707317
2000	71.24634146341464
2001	72.2487804878049
2002	72.34878048780489
2003	72.30000000000001
2004	72.64878048780488
2005	72.64878048780488
2006	73.09756097560977
2007	73.15121951219513
2008	73.70243902439026
2009	73.90487804878049
2010	74.20731707317074
2011	74.85853658536587
2012	75.06341463414634
2013	75.5658536585366
2014	75.76341463414634
2015	75.56829268292685
2016	76.06341463414635
2017	75.81707317073172
2018	76.0658536585366
2019	76.31951219512194
2020	75.56829268292685
2021	74.16341463414635
2022	76.01707317073172