Year	years
1960	56.973
1961	57.807
1962	58.584
1963	59.297
1964	59.938
1965	60.497
1966	60.99
1967	61.452
1968	61.91
1969	62.388
1970	62.918
1971	63.495
1972	64.093
1973	64.698
1974	65.288
1975	65.85
1976	66.386
1977	66.913
1978	67.45
1979	67.996
1980	68.576
1981	69.183
1982	69.798
1983	70.388
1984	70.963
1985	71.495
1986	71.983
1987	72.433
1988	72.862
1989	73.259
1990	73.647
1991	74.009
1992	74.357
1993	74.681
1994	74.99
1995	75.282
1996	75.566
1997	75.834
1998	76.082
1999	76.308
2000	76.512
2001	76.685
2002	76.826
2003	76.921
2004	76.983
2005	76.986
2006	76.981
2007	76.956
2008	76.952
2009	76.993
2010	77.117
2011	77.311
2012	77.535
2013	77.706
2014	77.782
2015	77.692
2016	77.486
2017	77.303
2018	77.286
2019	77.574
2020	74.314
2021	74.864
2022	78.161