Year	years
1960	64.917
1961	65.325
1962	65.749
1963	66.057
1964	66.455
1965	66.674
1966	66.96
1967	67.08
1968	67.304
1969	67.351
1970	67.354
1971	67.292
1972	67.546
1973	67.603
1974	67.647
1975	67.897
1976	67.929
1977	67.958
1978	68
1979	68.296
1980	68.681
1981	69.093
1982	69.588
1983	69.317
1984	69.178
1985	69.122
1986	70.987
1987	71.331
1988	71.5
1989	72.121
1990	71.564
1991	70.302
1992	71.239
1993	70.306
1994	68.705
1995	68.961
1996	67.842
1997	68.639
1998	68.895
1999	69.044
2000	70.035
2001	70.466
2002	70.505
2003	70.997
2004	71.621
2005	72.045
2006	72.564
2007	72.996
2008	73.477
2009	73.876
2010	73.778
2011	73.679
2012	73.625
2013	73.586
2014	73.524
2015	73.838
2016	74.51
2017	75.059
2018	75.232
2019	75.617
2020	74.852
2021	73.547
2022	73.32