Year	years
1960	49.697
1961	50.194
1962	50.594
1963	51.078
1964	51.442
1965	51.835
1966	52.223
1967	52.662
1968	53.088
1969	53.576
1970	54.058
1971	54.538
1972	54.875
1973	55.31
1974	55.75
1975	55.942
1976	56.334
1977	56.532
1978	56.907
1979	57.203
1980	57.621
1981	58.044
1982	58.141
1983	58.509
1984	58.838
1985	59.16
1986	59.719
1987	60.169
1988	60.395
1989	60.531
1990	60.58
1991	60.659
1992	60.39
1993	60.291
1994	60.197
1995	60.023
1996	60.028
1997	60.026
1998	60.466
1999	60.809
2000	61.326
2001	61.571
2002	61.847
2003	62.178
2004	62.418
2005	62.56
2006	62.908
2007	63.368
2008	64.01
2009	64.586
2010	64.937
2011	65.226
2012	65.496
2013	65.484
2014	65.219
2015	65.396
2016	65.538
2017	65.593
2018	65.408
2019	65.552
2020	65.392
2021	65.865
2022	65.916