Year	years
1960	63.132
1961	63.575
1962	63.677
1963	63.832
1964	64.281
1965	64.38
1966	64.517
1967	64.882
1968	64.975
1969	65.083
1970	65.17
1971	65.22
1972	65.341
1973	65.668
1974	65.73
1975	50.806
1976	28.022
1977	55.309
1978	55.376
1979	55.436
1980	55.736
1981	55.872
1982	39.024
1983	53.585
1984	53.822
1985	54.015
1986	54.471
1987	57.352
1988	57.748
1989	57.627
1990	58.044
1991	69.744
1992	69.767
1993	69.796
1994	70.134
1995	70.762
1996	70.891
1997	71.124
1998	71.312
1999	71.893
2000	72.251
2001	72.558
2002	72.957
2003	73.657
2004	73.919
2005	74.223
2006	73.145
2007	74.719
2008	75.489
2009	75.826
2010	76.136
2011	76.407
2012	76.666
2013	76.782
2014	76.971
2015	77.234
2016	77.492
2017	77.599
2018	77.784
2019	77.251
2020	75.637
2021	72.847
2022	72.237