Year	years
1960	57.751
1961	58.136
1962	58.476
1963	58.888
1964	59.042
1965	59.375
1966	59.648
1967	59.872
1968	60.061
1969	60.143
1970	60.053
1971	60.306
1972	60.1
1973	59.834
1974	59.878
1975	59.913
1976	59.93
1977	60.45
1978	60.454
1979	60.627
1980	60.763
1981	60.808
1982	61.051
1983	61.258
1984	61.405
1985	61.751
1986	61.909
1987	62.547
1988	63.148
1989	63.726
1990	64.146
1991	64.527
1992	65.286
1993	65.788
1994	66.234
1995	66.562
1996	66.905
1997	67.141
1998	67.346
1999	67.533
2000	67.638
2001	67.865
2002	68.052
2003	68.189
2004	68.344
2005	68.54
2006	68.612
2007	68.794
2008	68.883
2009	68.949
2010	69.064
2011	69.112
2012	69.191
2013	69.16
2014	69.407
2015	69.486
2016	69.571
2017	69.667
2018	69.815
2019	69.986
2020	70.244
2021	67.172
2022	70.218