Year	years
1960	69.25460975609757
1961	69.73839024390244
1962	69.46231707317075
1963	69.70978048780489
1964	70.61924390243904
1965	70.59748780487806
1966	70.7689268292683
1967	70.92978048780488
1968	70.81278048780489
1969	70.97802439024392
1970	70.74448780487806
1971	71.01170731707319
1972	70.84931707317075
1973	71.00065853658538
1974	70.85468292682927
1975	70.45709756097561
1976	70.39682926829269
1977	70.28902439024392
1978	70.08173170731708
1979	69.93363414634146
1980	69.92770731707319
1981	69.90751219512197
1982	70.0769024390244
1983	69.7948536585366
1984	69.56319512195124
1985	70.99268292682929
1986	71.54951219512196
1987	70.99024390243902
1988	71.34146341463415
1989	71.48292682926831
1990	70.83658536585365
1991	70.37804878048782
1992	70.0219512195122
1993	68.97073170731707
1994	68.76829268292683
1995	68.4609756097561
1996	68.51219512195122
1997	68.4609756097561
1998	68.40731707317074
1999	67.90731707317074
2000	68.91219512195123
2001	68.50731707317074
2002	68.05609756097562
2003	68.55365853658539
2004	68.95609756097562
2005	68.85121951219512
2006	69.40487804878049
2007	70.20731707317074
2008	70.45609756097562
2009	70.40731707317074
2010	70.40487804878049
2011	70.55365853658537
2012	71.96585365853657
2013	72.47073170731707
2014	72.97073170731709
2015	73.62439024390245
2016	73.8268292682927
2017	74.12926829268294
2018	74.17560975609757
2019	74.2268292682927
2020	72.45721951219514
2021	72.37068292682928
2022	73.11146341463416