Year	years
1960	57.588
1961	58.199
1962	58.934
1963	59.552
1964	60.219
1965	60.805
1966	61.154
1967	61.576
1968	61.772
1969	61.538
1970	61.713
1971	61.796
1972	61.784
1973	61.022
1974	61.686
1975	61.852
1976	61.975
1977	62.273
1978	62.527
1979	62.941
1980	62.734
1981	62.729
1982	62.793
1983	63.29
1984	63.892
1985	64.526
1986	64.715
1987	64.936
1988	65.149
1989	65.277
1990	65.508
1991	65.643
1992	65.827
1993	65.928
1994	66.125
1995	66.286
1996	66.408
1997	66.448
1998	66.68
1999	66.763
2000	66.31
2001	66.34
2002	65.748
2003	66.177
2004	66.424
2005	66.632
2006	66.855
2007	66.826
2008	66.935
2009	67.089
2010	67.328
2011	67.523
2012	67.552
2013	67.428
2014	67.376
2015	66.844
2016	67.24
2017	67.79
2018	67.81
2019	67.893
2020	67.924
2021	67.114
2022	68.312