Year	years
1960	57.015
1961	58.485
1962	59.506
1963	60.287
1964	61.368
1965	62.245
1966	63.133
1967	64.009
1968	64.899
1969	65.292
1970	65.962
1971	66.342
1972	66.612
1973	66.823
1974	67.676
1975	68.208
1976	68.796
1977	69.735
1978	69.654
1979	69.629
1980	69.41
1981	70.391
1982	70.896
1983	71.778
1984	72.697
1985	72.738
1986	72.889
1987	72.392
1988	72.273
1989	72.421
1990	72.461
1991	72.858
1992	73.436
1993	73.594
1994	73.359
1995	73.399
1996	73.013
1997	72.419
1998	72.301
1999	72.654
2000	73.135
2001	73.93
2002	74.568
2003	75.039
2004	75.287
2005	75.492
2006	75.699
2007	75.746
2008	75.735
2009	75.808
2010	75.707
2011	75.796
2012	75.724
2013	75.781
2014	76.104
2015	76.401
2016	76.582
2017	76.758
2018	76.968
2019	77.058
2020	77.055
2021	74.717
2022	74.887