Year	years
1960	56.82
1961	57.15
1962	57.663
1963	58.212
1964	58.719
1965	59.184
1966	59.388
1967	59.705
1968	59.771
1969	59.99
1970	60.028
1971	59.935
1972	59.998
1973	60.37
1974	60.434
1975	60.473
1976	60.74
1977	60.746
1978	60.754
1979	61.03
1980	61.377
1981	61.84
1982	62.464
1983	61.791
1984	61.92
1985	61.997
1986	63.964
1987	64.584
1988	64.51
1989	64.915
1990	64.302
1991	63.424
1992	62.572
1993	62.628
1994	61.33
1995	61.17
1996	60.578
1997	61.604
1998	62.011
1999	61.996
2000	62.719
2001	63.035
2002	63.289
2003	63.754
2004	64.03
2005	64.229
2006	64.367
2007	64.853
2008	65.265
2009	65.275
2010	64.993
2011	64.805
2012	64.781
2013	64.75
2014	64.695
2015	64.827
2016	65.474
2017	66.077
2018	65.921
2019	66.378
2020	65.692
2021	64.443
2022	64.217