Year	years
1960	39.086
1961	39.579
1962	39.975
1963	40.522
1964	41.119
1965	41.68
1966	42.289
1967	42.975
1968	43.72
1969	44.391
1970	45.134
1971	46.216
1972	47.232
1973	48.412
1974	49.589
1975	50.844
1976	51.969
1977	53.021
1978	51.516
1979	55.119
1980	56.074
1981	56.894
1982	57.786
1983	58.595
1984	59.42
1985	60.403
1986	61.211
1987	61.998
1988	62.812
1989	63.546
1990	64.307
1991	65.103
1992	65.836
1993	66.648
1994	67.441
1995	68.435
1996	69.451
1997	70.019
1998	70.323
1999	70.975
2000	71.763
2001	73.175
2002	74.209
2003	75.184
2004	74.746
2005	76.307
2006	76.652
2007	77.091
2008	77.829
2009	78.324
2010	78.795
2011	79.188
2012	79.611
2013	80.103
2014	80.406
2015	80.675
2016	80.814
2017	81.058
2018	81.074
2019	81.162
2020	81.273
2021	81.019
2022	81.844