Year	years
1960	58.621
1961	59.338
1962	60.048
1963	60.626
1964	60.847
1965	61.524
1966	61.764
1967	62.426
1968	62.611
1969	63.176
1970	63.76
1971	64.333
1972	64.546
1973	65.07
1974	65.613
1975	66.043
1976	66.451
1977	66.906
1978	67.331
1979	67.495
1980	67.901
1981	68.074
1982	68.548
1983	68.782
1984	69.323
1985	69.417
1986	69.638
1987	69.696
1988	70.32
1989	70.559
1990	70.776
1991	70.961
1992	71.328
1993	71.457
1994	71.542
1995	71.981
1996	72.065
1997	72.533
1998	72.696
1999	72.859
2000	72.811
2001	73.473
2002	72.093
2003	73.739
2004	73.785
2005	73.884
2006	73.937
2007	73.953
2008	74.253
2009	74.267
2010	74.422
2011	74.545
2012	74.664
2013	74.76
2014	74.867
2015	74.764
2016	74.979
2017	74.973
2018	74.955
2019	74.842
2020	74.54
2021	74.608
2022	74.823