Year	years
1960	56.22304878048781
1961	57.79982926829269
1962	57.523341463414646
1963	56.69934146341465
1964	58.9859268292683
1965	60.0019268292683
1966	61.959853658536595
1967	62.12785365853659
1968	62.863780487804874
1969	63.02656097560977
1970	63.719390243902446
1971	64.61760975609756
1972	65.54914634146343
1973	65.93612195121952
1974	66.592
1975	66.98778048780488
1976	67.74556097560976
1977	68.44343902439026
1978	69.35914634146341
1979	69.65021951219512
1980	69.24712195121953
1981	69.81048780487806
1982	69.95556097560977
1983	69.48268292682928
1984	70.02175609756098
1985	70.08207317073172
1986	70.383
1987	70.37660975609757
1988	70.81943902439025
1989	71.1368292682927
1990	71.23380487804877
1991	71.84443902439025
1992	71.24407317073171
1993	71.92529268292682
1994	71.69268292682928
1995	71.84878048780489
1996	72.49512195121952
1997	72.44634146341464
1998	72.29756097560977
1999	72.79024390243904
2000	72.94634146341465
2001	73.43658536585367
2002	73.03902439024391
2003	73.24146341463415
2004	73.59756097560977
2005	73.69756097560976
2006	73.89512195121952
2007	73.80000000000001
2008	74.4
2009	74.44634146341464
2010	74.99756097560976
2011	75.1
2012	74.90243902439026
2013	75.4
2014	75.45121951219514
2015	75.40243902439025
2016	75.4
2017	75.95365853658537
2018	76.64878048780488
2019	76.60243902439025
2020	74.39512195121951
2021	73.24634146341464
2022	74.4248780487805