Year	years
1960	43.7873801599881
1961	44.37499490994549
1962	44.9053901444544
1963	45.68375180146011
1964	46.33425980328898
1965	46.92971981195024
1966	47.632234287059674
1967	48.02331964412683
1968	48.90180038172553
1969	49.475909448267885
1970	50.22788160188613
1971	49.76485492092405
1972	51.3084471664327
1973	51.76885181695904
1974	52.1296347357472
1975	52.67137149158346
1976	53.31390063505517
1977	53.856952668473596
1978	54.34629691814316
1979	54.760384606741454
1980	55.22118329732893
1981	55.85014995525342
1982	56.127733055705924
1983	56.51527279853864
1984	56.768551797127486
1985	56.584687996417316
1986	56.432240624857656
1987	56.390315014309486
1988	56.6594014962303
1989	56.8109758255527
1990	56.99333291762789
1991	56.7478170313165
1992	56.3949330982832
1993	56.115670086830036
1994	55.95127966793195
1995	55.7169968805766
1996	55.906907034615195
1997	56.0371675850001
1998	56.20142917221827
1999	56.63179116751736
2000	56.950801829656335
2001	57.17077904215432
2002	57.49418693885432
2003	57.82915099303947
2004	58.24587357518718
2005	58.30401276868833
2006	59.24939156161465
2007	59.603951964256936
2008	59.940900377324205
2009	60.27735908280908
2010	60.62711383901108
2011	61.03719069920708
2012	61.22244987780288
2013	61.565625623930835
2014	61.763290023863135
2015	62.013284697736594
2016	62.126622865220014
2017	62.55181392758405
2018	62.72090331130469
2019	62.92145305315701
2020	62.77224197204625
2021	62.43451462566222
2022	63.00211077327953