Year	years
1960	56.539
1961	57.463
1962	57.448
1963	58.173
1964	58.605
1965	59.141
1966	59.627
1967	60.335
1968	60.868
1969	61.276
1970	62.205
1971	62.854
1972	63.26
1973	63.776
1974	64.364
1975	64.877
1976	65.452
1977	65.618
1978	65.895
1979	66.268
1980	66.419
1981	67.096
1982	67.363
1983	67.854
1984	68.231
1985	68.404
1986	68.869
1987	68.85
1988	68.967
1989	68.906
1990	69.293
1991	69.385
1992	69.373
1993	69.314
1994	69.126
1995	69.484
1996	69.504
1997	69.994
1998	69.725
1999	69.295
2000	69.073
2001	67.526
2002	69.188
2003	68.292
2004	68.95
2005	69.138
2006	68.894
2007	69.129
2008	68.325
2009	68.523
2010	68.918
2011	68.983
2012	68.949
2013	69.297
2014	68.887
2015	69.041
2016	67.757
2017	67.935
2018	67.832
2019	68.034
2020	66.739
2021	66.259
2022	66.875