Year	years
1960	40.018
1961	40.536
1962	40.919
1963	41.328
1964	41.572
1965	41.961
1966	42.56
1967	43.42
1968	44.445
1969	45.453
1970	46.439
1971	47.387
1972	48.303
1973	48.894
1974	49.45
1975	48.543
1976	50.495
1977	50.967
1978	51.627
1979	52.118
1980	52.595
1981	53.059
1982	53.535
1983	53.813
1984	54.479
1985	54.943
1986	55.446
1987	55.628
1988	56.117
1989	56.489
1990	56.873
1991	57.177
1992	57.815
1993	58.521
1994	58.922
1995	59.397
1996	59.751
1997	60.231
1998	60.117
1999	60.495
2000	60.373
2001	60.783
2002	60.656
2003	60.863
2004	61.269
2005	61.431
2006	61.645
2007	61.999
2008	62.269
2009	62.869
2010	63.06
2011	63.608
2012	63.801
2013	64.393
2014	64.55
2015	65.163
2016	65.341
2017	65.986
2018	66.195
2019	66.306
2020	66.593
2021	65.827
2022	66.061