Year	years
1960	55.083024390243914
1961	55.3209512195122
1962	55.648926829268305
1963	55.976951219512195
1964	56.18034146341464
1965	56.40948780487806
1966	56.81014634146342
1967	57.03431707317073
1968	57.35746341463415
1969	57.671536585365864
1970	58.00531707317074
1971	58.3039268292683
1972	58.61475609756098
1973	58.99068292682928
1974	59.327048780487814
1975	59.461756097560986
1976	59.66558536585366
1977	60.03975609756098
1978	60.375609756097575
1979	60.79502439024392
1980	61.08146341463415
1981	61.349195121951226
1982	61.67443902439025
1983	62.17707317073171
1984	62.42119512195123
1985	63.019512195121955
1986	63.330414634146344
1987	63.66043902439024
1988	63.917390243902446
1989	67.90731707317074
1990	68.29756097560976
1991	68.55121951219513
1992	68.10243902439025
1993	67.19268292682928
1994	66.03902439024391
1995	65.79024390243903
1996	66.54390243902441
1997	66.89268292682927
1998	67.05121951219513
1999	68.65609756097562
2000	68.55853658536587
2001	68.70731707317073
2002	68.15609756097561
2003	68.25609756097562
2004	68.15365853658537
2005	67.95609756097562
2006	67.6951219512195
2007	67.89512195121952
2008	68.45121951219512
2009	69.10243902439026
2010	69.30000000000001
2011	69.60243902439025
2012	70.00243902439024
2013	70.20243902439024
2014	70.40243902439025
2015	70.65121951219513
2016	70.95121951219512
2017	71.20000000000002
2018	71.4
2019	71.60000000000001
2020	71.80000000000001
2021	71.9
2022	72.04878048780488