Year	years
1960	54.751
1961	55.254
1962	55.595
1963	55.905
1964	56.217
1965	56.555
1966	56.864
1967	57.22
1968	57.506
1969	57.888
1970	58.317
1971	58.767
1972	59.175
1973	59.669
1974	60.163
1975	60.652
1976	61.21
1977	61.794
1978	62.366
1979	62.814
1980	63.224
1981	63.832
1982	64.296
1983	64.773
1984	65.014
1985	65.405
1986	65.942
1987	65.968
1988	66.475
1989	66.356
1990	66.712
1991	66.945
1992	67.067
1993	66.832
1994	66.189
1995	65.749
1996	64.721
1997	63.828
1998	62.883
1999	62.008
2000	61.049
2001	59.47
2002	57.668
2003	56.232
2004	55.721
2005	55.431
2006	55.892
2007	56.852
2008	58.111
2009	59.722
2010	61.266
2011	63.111
2012	64.449
2013	65.267
2014	66.259
2015	66.781
2016	67.794
2017	68.43
2018	68.74
2019	69.107
2020	67.964
2021	64.999
2022	64.181