Year	years
1960	44.129
1961	44.641
1962	45.071
1963	46.01
1964	46.543
1965	47.141
1966	47.833
1967	48.388
1968	49.105
1969	49.726
1970	50.435
1971	50.804
1972	51.474
1973	52.189
1974	52.813
1975	53.346
1976	53.898
1977	54.324
1978	54.803
1979	55.218
1980	55.678
1981	55.966
1982	56.265
1983	56.499
1984	56.706
1985	56.954
1986	57.005
1987	57.257
1988	57.413
1989	57.668
1990	57.801
1991	58.024
1992	58.314
1993	58.658
1994	58.897
1995	59.212
1996	59.266
1997	59.596
1998	58.975
1999	59.965
2000	60.076
2001	60.114
2002	60.003
2003	60.102
2004	59.974
2005	60.112
2006	60.373
2007	60.592
2008	60.832
2009	60.983
2010	61.297
2011	61.51
2012	61.633
2013	61.792
2014	62.085
2015	62.286
2016	62.439
2017	62.774
2018	62.869
2019	62.963
2020	63.395
2021	62.948
2022	63.378