Year	years
1960	39.143
1961	39.348
1962	40.756
1963	39.241
1964	39.53
1965	39.898
1966	39.971
1967	40.524
1968	40.834
1969	41.134
1970	41.488
1971	41.913
1972	42.282
1973	42.524
1974	44.441
1975	44.765
1976	44.392
1977	44.744
1978	44.908
1979	45.812
1980	47.085
1981	47.728
1982	48.514
1983	49.029
1984	49.547
1985	50.098
1986	50.658
1987	51.046
1988	51.507
1989	51.906
1990	52.335
1991	53.124
1992	53.55
1993	53.997
1994	54.307
1995	54.901
1996	55.374
1997	55.682
1998	56.025
1999	56.41
2000	56.839
2001	57.427
2002	57.833
2003	58.14
2004	58.302
2005	58.94
2006	59.405
2007	60.013
2008	60.715
2009	61.232
2010	61.917
2011	62.969
2012	63.451
2013	63.877
2014	64.346
2015	64.739
2016	65.122
2017	65.512
2018	65.793
2019	66.155
2020	66.519
2021	66.154
2022	66.94