Year	years
1960	38.529
1961	38.982
1962	39.458
1963	40.071
1964	40.722
1965	41.383
1966	42.055
1967	42.771
1968	43.554
1969	44.275
1970	45.068
1971	46.125
1972	47.112
1973	48.214
1974	49.359
1975	50.519
1976	51.592
1977	52.632
1978	51.105
1979	54.676
1980	55.621
1981	56.421
1982	57.296
1983	58.09
1984	58.916
1985	59.749
1986	60.517
1987	61.31
1988	62.132
1989	62.847
1990	63.578
1991	64.304
1992	65.007
1993	65.739
1994	66.511
1995	67.476
1996	68.702
1997	69.225
1998	69.572
1999	70.088
2000	70.876
2001	72.181
2002	73.291
2003	74.06
2004	73.538
2005	74.751
2006	75.13
2007	75.686
2008	76.543
2009	77.069
2010	77.657
2011	78.124
2012	78.682
2013	79.057
2014	79.424
2015	79.695
2016	79.872
2017	79.943
2018	80.013
2019	80.116
2020	79.875
2021	79.918
2022	80.839