Year	years
1960	40.532
1961	40.516
1962	39.323
1963	42.908
1964	42.788
1965	42.714
1966	42.543
1967	42.568
1968	42.642
1969	42.781
1970	43.16
1971	43.67
1972	44.346
1973	45.079
1974	46.034
1975	46.972
1976	47.985
1977	49.191
1978	50.353
1979	51.755
1980	53.261
1981	55.276
1982	57.428
1983	59.51
1984	61.658
1985	63.588
1986	65.159
1987	65.83
1988	66.971
1989	67.085
1990	67.416
1991	67.688
1992	67.757
1993	67.719
1994	67.361
1995	67.454
1996	68.749
1997	69.171
1998	69.451
1999	70.032
2000	70.478
2001	70.823
2002	71.23
2003	71.287
2004	71.762
2005	72.061
2006	72.334
2007	72.602
2008	72.941
2009	73.62
2010	73.808
2011	74.123
2012	74.202
2013	74.615
2014	75.11
2015	75.622
2016	75.732
2017	75.743
2018	76.066
2019	76.474
2020	74.453
2021	76.377
2022	77.129