Year	years
1960	46.575
1961	47.228
1962	47.838
1963	48.479
1964	49.048
1965	49.752
1966	50.349
1967	50.892
1968	51.439
1969	51.957
1970	52.555
1971	53.073
1972	53.605
1973	54.057
1974	54.567
1975	55.035
1976	55.569
1977	56.089
1978	56.659
1979	57.053
1980	57.454
1981	57.816
1982	58.106
1983	58.601
1984	58.894
1985	59.311
1986	59.641
1987	59.894
1988	60.006
1989	60.265
1990	60.311
1991	60.397
1992	60.545
1993	60.718
1994	60.701
1995	60.704
1996	60.612
1997	60.662
1998	60.79
1999	60.849
2000	61.069
2001	61.27
2002	61.292
2003	61.671
2004	61.838
2005	61.959
2006	62.375
2007	62.618
2008	63.083
2009	63.303
2010	63.898
2011	64.045
2012	64.587
2013	64.776
2014	64.974
2015	65.46
2016	65.802
2017	66.189
2018	66.306
2019	66.603
2020	66.531
2021	65.821
2022	65.694