Year	years
1960	55.241
1961	55.782
1962	56.268
1963	56.776
1964	57.223
1965	57.691
1966	58.078
1967	58.477
1968	58.92
1969	59.321
1970	59.73
1971	60.155
1972	60.582
1973	61.022
1974	61.364
1975	61.816
1976	62.224
1977	62.685
1978	63.147
1979	63.653
1980	64.179
1981	64.741
1982	65.288
1983	65.778
1984	66.26
1985	66.718
1986	67.209
1987	67.715
1988	68.091
1989	68.532
1990	69.041
1991	69.335
1992	69.775
1993	70.18
1994	70.646
1995	71.089
1996	71.592
1997	72.03
1998	72.432
1999	72.813
2000	73.431
2001	73.969
2002	74.189
2003	74.42
2004	74.916
2005	75.402
2006	75.665
2007	75.88
2008	76.134
2009	76.299
2010	76.592
2011	76.651
2012	76.869
2013	77.12
2014	77.432
2015	77.572
2016	77.848
2017	78.032
2018	78.266
2019	78.469
2020	77.375
2021	76.009
2022	76.596