Year	years
1960	45.026
1961	45.702
1962	46.333
1963	46.976
1964	47.423
1965	48.199
1966	48.781
1967	49.285
1968	49.823
1969	50.303
1970	50.943
1971	51.492
1972	51.996
1973	52.392
1974	52.892
1975	53.353
1976	53.853
1977	54.369
1978	54.864
1979	55.263
1980	55.716
1981	56.002
1982	56.411
1983	56.927
1984	57.259
1985	57.648
1986	58.073
1987	58.287
1988	58.524
1989	58.809
1990	58.964
1991	59.098
1992	59.443
1993	59.54
1994	59.611
1995	59.609
1996	59.539
1997	59.586
1998	59.867
1999	59.874
2000	59.896
2001	60.179
2002	60.186
2003	60.374
2004	60.637
2005	60.722
2006	61.018
2007	61.203
2008	61.475
2009	61.591
2010	62.082
2011	62.157
2012	62.608
2013	62.762
2014	62.937
2015	63.357
2016	63.837
2017	63.952
2018	64.115
2019	64.581
2020	64.258
2021	63.488
2022	63.361