Year	years
1960	67.46521951219512
1961	67.6309512195122
1962	67.30051219512195
1963	67.75717073170732
1964	68.36717073170733
1965	67.88775609756097
1966	67.90119512195123
1967	67.59380487804879
1968	67.48936585365855
1969	66.87629268292685
1970	68.13365853658536
1971	68.37658536585366
1972	68.30853658536587
1973	68.29463414634148
1974	68.32024390243903
1975	67.7239024390244
1976	67.48756097560975
1977	67.37634146341463
1978	67.3909756097561
1979	67.11439024390243
1980	67.0339024390244
1981	67.26390243902439
1982	67.80609756097562
1983	67.65268292682927
1984	67.20268292682927
1985	67.85682926829269
1986	69.38975609756099
1987	69.44000000000001
1988	69.46439024390244
1989	69.17170731707317
1990	68.88609756097561
1991	68.47439024390245
1992	66.87317073170732
1993	64.9358536585366
1994	64.46707317073171
1995	64.69073170731708
1996	65.85414634146342
1997	66.6987804878049
1998	67.02975609756098
1999	65.98219512195124
2000	65.48365853658537
2001	65.38341463414635
2002	65.12878048780489
2003	65.02756097560976
2004	65.4709756097561
2005	65.52975609756099
2006	66.72756097560976
2007	67.58682926829269
2008	67.94926829268293
2009	68.68463414634147
2010	68.84121951219514
2011	69.6839024390244
2012	70.07219512195124
2013	70.57878048780488
2014	70.74365853658537
2015	71.18341463414635
2016	71.65121951219513
2017	72.45146341463416
2018	72.66219512195121
2019	73.0839024390244
2020	71.3387804878049
2021	69.90024390243903
2022	72.54560975609758