Year	years
1960	58.034
1961	58.46
1962	58.864
1963	59.202
1964	59.494
1965	59.742
1966	59.937
1967	60.113
1968	60.256
1969	60.38
1970	60.469
1971	60.555
1972	60.636
1973	60.683
1974	60.76
1975	60.819
1976	60.892
1977	60.955
1978	61.052
1979	61.133
1980	61.229
1981	61.311
1982	61.406
1983	61.491
1984	61.589
1985	61.66
1986	61.797
1987	61.947
1988	62.085
1989	62.238
1990	62.415
1991	62.622
1992	62.787
1993	63.152
1994	63.372
1995	63.136
1996	63.205
1997	63.356
1998	63.9
1999	64.17
2000	64.483
2001	64.788
2002	64.728
2003	64.6
2004	64.93
2005	65.132
2006	65.667
2007	66.254
2008	66.288
2009	66.563
2010	66.743
2011	66.982
2012	67.23
2013	67.473
2014	67.882
2015	68.201
2016	68.384
2017	68.667
2018	68.896
2019	69.124
2020	68.486
2021	65.673
2022	65.989