Year	years
1960	43.063
1961	43.667
1962	43.389
1963	44.908
1964	45.484
1965	46.056
1966	46.92
1967	47.519
1968	47.774
1969	49.154
1970	50.081
1971	51.092
1972	51.606
1973	53.246
1974	54.287
1975	55.224
1976	56.281
1977	57.35
1978	56.677
1979	59.734
1980	60.634
1981	61.35
1982	62.484
1983	63.591
1984	64.5
1985	65.304
1986	65.937
1987	66.268
1988	66.963
1989	67.727
1990	66.32
1991	68.596
1992	69.069
1993	69.323
1994	69.827
1995	70.038
1996	70.748
1997	70.968
1998	71.23
1999	71.942
2000	72.297
2001	72.559
2002	72.923
2003	72.23
2004	73.886
2005	74.356
2006	74.918
2007	75.364
2008	74.918
2009	75.011
2010	75.728
2011	76.383
2012	76.958
2013	77.211
2014	77.361
2015	77.765
2016	78.336
2017	78.904
2018	79.091
2019	79.055
2020	77.817
2021	76.808
2022	77.453