Year	years
1960	67.772
1961	67.895
1962	67.994
1963	68.084
1964	68.179
1965	68.294
1966	68.427
1967	68.558
1968	68.698
1969	68.815
1970	68.904
1971	68.969
1972	68.933
1973	69.096
1974	69.193
1975	69.335
1976	69.523
1977	69.746
1978	69.999
1979	70.279
1980	70.582
1981	70.901
1982	71.223
1983	71.539
1984	71.841
1985	72.123
1986	72.381
1987	72.613
1988	72.82
1989	73.002
1990	73.162
1991	73.305
1992	73.441
1993	73.579
1994	73.728
1995	73.896
1996	74.088
1997	74.298
1998	74.527
1999	74.769
2000	75.025
2001	75.285
2002	75.54
2003	75.785
2004	76.007
2005	76.194
2006	76.362
2007	76.498
2008	76.623
2009	76.738
2010	76.858
2011	76.983
2012	77.111
2013	77.24
2014	77.366
2015	77.483
2016	77.571
2017	77.625
2018	77.611
2019	77.508
2020	78.43
2021	75.436
2022	78