Year	years
1960	64.28
1961	62.054
1962	60.428
1963	63.027
1964	65.066
1965	65.375
1966	60.461
1967	64.388
1968	65.016
1969	64.665
1970	64.799
1971	64.812
1972	66.198
1973	68.424
1974	68.821
1975	68.908
1976	68.311
1977	68.316
1978	69.02
1979	69.9
1980	69.453
1981	69.829
1982	69.518
1983	70.14
1984	71.385
1985	70.245
1986	69.436
1987	70.004
1988	70.808
1989	70.77
1990	70.643
1991	70.96
1992	71.114
1993	70.464
1994	70.846
1995	72.616
1996	75.095
1997	74.358
1998	76.684
1999	75.83
2000	75.293
2001	75.701
2002	78.669
2003	77.079
2004	77.112
2005	74.349
2006	73.954
2007	75.137
2008	75.425
2009	76.827
2010	75.921
2011	77.138
2012	76.796
2013	76.017
2014	76.262
2015	76.427
2016	76.231
2017	79.119
2018	77.594
2019	77.791
2020	77.885
2021	75.817
2022	78.435