Year	years
1960	56.804
1961	57.124
1962	57.673
1963	58.159
1964	58.617
1965	59.173
1966	59.371
1967	59.768
1968	59.805
1969	59.399
1970	59.533
1971	59.574
1972	59.461
1973	58.689
1974	59.437
1975	59.562
1976	59.62
1977	59.911
1978	60.174
1979	60.634
1980	60.546
1981	60.644
1982	60.714
1983	61.133
1984	61.687
1985	62.275
1986	62.349
1987	62.593
1988	62.791
1989	62.958
1990	63.204
1991	63.349
1992	63.583
1993	63.715
1994	63.897
1995	64.077
1996	64.218
1997	64.306
1998	64.488
1999	64.577
2000	64.181
2001	64.273
2002	63.738
2003	64.247
2004	64.546
2005	64.776
2006	65.074
2007	65.084
2008	65.16
2009	65.298
2010	65.536
2011	65.678
2012	65.809
2013	65.609
2014	65.536
2015	64.915
2016	65.446
2017	66.008
2018	66.031
2019	66.126
2020	66.166
2021	65.426
2022	66.465