Year	years
1960	64.87360975609757
1961	65.41912195121951
1962	65.8979756097561
1963	66.81621951219513
1964	67.15053658536586
1965	67.98736585365855
1966	68.85468292682927
1967	68.8679756097561
1968	69.23768292682928
1969	69.00660975609756
1970	69.09219512195124
1971	69.53017073170733
1972	70.37419512195123
1973	70.59307317073171
1974	71.22075609756098
1975	71.17424390243903
1976	71.5699512195122
1977	71.35153658536585
1978	71.1449268292683
1979	70.48282926829269
1980	71.60912195121952
1981	71.2397804878049
1982	71.18114634146343
1983	71.13168292682927
1984	72.76826829268293
1985	73.85436585365855
1986	74.24546341463416
1987	75.09441463414636
1988	76.23753658536586
1989	75.53790243902439
1990	75.5668780487805
1991	75.68260975609756
1992	74.36536585365855
1993	74.63329268292682
1994	73.24553658536585
1995	74.10900000000001
1996	73.4630243902439
1997	73.47907317073172
1998	73.31421951219512
1999	72.64075609756098
2000	73.81848780487806
2001	74.06941463414636
2002	73.90648780487807
2003	73.93173170731707
2004	74.5639512195122
2005	73.9829268292683
2006	73.8390243902439
2007	74.33902439024392
2008	75.13658536585366
2009	75.1439024390244
2010	75.99024390243903
2011	75.9829268292683
2012	76.20000000000002
2013	76.49024390243903
2014	76.44146341463414
2015	76.44878048780488
2016	76.44146341463414
2017	76.48536585365855
2018	76.84146341463416
2019	76.6829268292683
2020	75.93170731707318
2021	73.82439024390244
2022	76.1878048780488