Year	years
1960	63.978
1961	64.36
1962	64.244
1963	64.449
1964	64.363
1965	64.593
1966	64.891
1967	64.992
1968	64.89
1969	64.859
1970	65.589
1971	65.541
1972	65.923
1973	66.323
1974	66.563
1975	67.081
1976	67.228
1977	67.861
1978	68.197
1979	68.491
1980	68.564
1981	68.976
1982	68.937
1983	69.267
1984	69.195
1985	69.651
1986	70.119
1987	70.564
1988	71.052
1989	71.425
1990	71.784
1991	72.319
1992	72.43
1993	72.565
1994	73.172
1995	73.133
1996	73.307
1997	73.09
1998	73.474
1999	73.722
2000	73.926
2001	74.186
2002	74.408
2003	74.08
2004	74.855
2005	75.139
2006	75.433
2007	75.006
2008	75.641
2009	75.936
2010	75.721
2011	76.124
2012	76.467
2013	76.491
2014	76.755
2015	76.76
2016	76.308
2017	76.833
2018	76.999
2019	77.284
2020	75.892
2021	75.39
2022	76.064