Year	years
1960	67.933
1961	68.519
1962	69.083
1963	66.875
1964	67.364
1965	70.425
1966	70.768
1967	71.285
1968	71.428
1969	71.663
1970	72.084
1971	72.405
1972	73.014
1973	73.168
1974	71.681
1975	73.356
1976	73.742
1977	74.049
1978	74.4
1979	74.422
1980	74.494
1981	74.407
1982	74.496
1983	74.503
1984	74.431
1985	74.862
1986	74.572
1987	75.196
1988	75.273
1989	75.566
1990	75.382
1991	75.478
1992	76.139
1993	76.722
1994	76.526
1995	77.158
1996	77.567
1997	77.958
1998	78.417
1999	78.363
2000	78.552
2001	79.02
2002	79.635
2003	79.992
2004	80.105
2005	80.287
2006	80.522
2007	81.006
2008	81.198
2009	81.766
2010	82.048
2011	82.336
2012	82.15
2013	82.405
2014	82.723
2015	82.873
2016	83.185
2017	83.415
2018	83.058
2019	83.27
2020	83.448
2021	83.204
2022	83.673