Year	years
1960	58.370512195121954
1961	58.50307317073171
1962	58.62175609756098
1963	58.94451219512196
1964	59.15748780487806
1965	59.461682926829276
1966	59.69921951219512
1967	59.87341463414635
1968	59.99836585365854
1969	60.19117073170732
1970	60.4229756097561
1971	60.647560975609764
1972	60.994951219512195
1973	61.277390243902445
1974	61.52497560975611
1975	61.790609756097574
1976	61.64034146341464
1977	61.85300000000001
1978	62.06560975609757
1979	62.25458536585367
1980	66.62439024390245
1981	66.70609756097562
1982	66.7878048780488
1983	67.66219512195123
1984	68.53658536585367
1985	68.5365853658537
1986	68.9134146341463
1987	69.290243902439
1988	68.8487804878049
1989	68.290243902439
1990	68.3365853658537
1991	67.6
1992	67.4
1993	65.4
1994	64.9
1995	63.5
1996	63.6
1997	64
1998	64.5
1999	65.63
2000	65.45
2001	65.76
2002	65.95
2003	65.74
2004	66.06
2005	65.86
2006	66.15
2007	66.34
2008	67.11
2009	68.39
2010	68.45
2011	68.69
2012	69.52
2013	70.62
2014	71.44
2015	71.97
2016	72.41
2017	72.95
2018	73.15
2019	73.18
2020	71.37
2021	70.23
2022	74.44