Year	years
1960	46.613
1961	47.606
1962	48.646
1963	49.584
1964	50.967
1965	52.131
1966	53.298
1967	54.424
1968	55.692
1969	56.956
1970	58.249
1971	59.478
1972	60.683
1973	61.656
1974	62.74
1975	63.484
1976	64.229
1977	64.911
1978	65.589
1979	66.199
1980	66.865
1981	67.496
1982	68.037
1983	68.317
1984	68.824
1985	69.075
1986	69.303
1987	69.768
1988	69.907
1989	70.09
1990	70.262
1991	70.698
1992	70.831
1993	70.938
1994	71.027
1995	71.152
1996	71.365
1997	71.555
1998	71.704
1999	72.348
2000	73.166
2001	73.388
2002	73.631
2003	74.984
2004	75.202
2005	75.417
2006	75.639
2007	75.825
2008	76.027
2009	76.233
2010	76.459
2011	76.665
2012	76.931
2013	77.084
2014	77.331
2015	77.563
2016	77.684
2017	77.871
2018	78.028
2019	78.175
2020	77.464
2021	77.216
2022	77.72