Year	years
1960	67.68048780487806
1961	67.77804878048781
1962	67.4268292682927
1963	68.37560975609757
1964	68.62926829268294
1965	69.42926829268292
1966	69.8268292682927
1967	69.42439024390244
1968	70.21951219512195
1969	69.71951219512196
1970	69.86829268292684
1971	69.61219512195122
1972	70.66585365853659
1973	70.66341463414635
1974	71.11707317073171
1975	70.56097560975611
1976	70.65609756097561
1977	70.40243902439025
1978	70.35121951219514
1979	70.75121951219514
1980	70.09756097560975
1981	71.05121951219513
1982	71.10243902439025
1983	71.00000000000001
1984	70.8
1985	70.54878048780489
1986	70.84878048780489
1987	70.89756097560976
1988	71.33170731707318
1989	71.0439024390244
1990	70.89024390243902
1991	70.58780487804879
1992	71.09024390243904
1993	71.59512195121953
1994	71.69512195121952
1995	71.89268292682927
1996	72.24634146341464
1997	72.64634146341464
1998	72.99756097560977
1999	73.04390243902441
2000	73.74878048780488
2001	74.20000000000002
2002	74.49756097560977
2003	74.59756097560977
2004	74.84634146341465
2005	74.99512195121952
2006	75.1439024390244
2007	75.2439024390244
2008	75.54390243902441
2009	75.69512195121952
2010	76.24634146341464
2011	76.69512195121952
2012	76.74634146341464
2013	77.00000000000001
2014	77.60243902439025
2015	77.45121951219512
2016	77.85121951219514
2017	77.75365853658538
2018	77.60243902439025
2019	77.90487804878049
2020	76.5
2021	75.50243902439024
2022	77.3048780487805