Year	years
1960	63.026
1961	62.865
1962	63.427
1963	63.822
1964	63.843
1965	64.147
1966	64.376
1967	64.798
1968	64.668
1969	64.685
1970	65.057
1971	65.283
1972	64.947
1973	65.561
1974	66.848
1975	66.786
1976	66.273
1977	66.641
1978	67.438
1979	67.768
1980	67.572
1981	67.65
1982	67.646
1983	67.935
1984	67.592
1985	67.543
1986	68.279
1987	68.281
1988	68.419
1989	68.438
1990	68.272
1991	68.859
1992	68.391
1993	68.811
1994	68.511
1995	69.17
1996	69.009
1997	68.719
1998	69.16
1999	68.377
2000	69.102
2001	69.646
2002	70.488
2003	69.729
2004	71.076
2005	71.308
2006	71.256
2007	71.652
2008	71.47
2009	73.126
2010	72.725
2011	73.278
2012	73.716
2013	73.962
2014	74.215
2015	74.503
2016	74.281
2017	74.23
2018	73.802
2019	74.228
2020	74.406
2021	72.971
2022	74.708