Year	years
1960	46.06561611742701
1961	46.459183188005944
1962	46.85024263293907
1963	47.162445799520555
1964	47.611692201963116
1965	47.14477374609789
1966	47.66352572489664
1967	48.041262967140824
1968	49.092499234247164
1969	49.52885233225979
1970	49.44020890016284
1971	49.14160967250497
1972	50.518611091760626
1973	51.07611649707043
1974	51.51519784623219
1975	52.13428987166858
1976	52.68705433116251
1977	53.458445777664934
1978	54.12633637982709
1979	54.735934408238265
1980	55.32637111992398
1981	55.89329983393772
1982	56.4121564162871
1983	56.95714118529173
1984	57.44815715129981
1985	57.85218874643344
1986	58.26227516381462
1987	58.66348097299145
1988	59.09841875176429
1989	59.49179368635632
1990	59.90221014076966
1991	60.08003559527056
1992	60.50789175953553
1993	60.73294098589314
1994	60.99850892422803
1995	61.2696499460086
1996	61.53945841134247
1997	61.99254068647359
1998	62.43419986141296
1999	62.98885745836559
2000	63.33666192499095
2001	63.73242487066275
2002	64.21102492899543
2003	64.67367926632352
2004	65.04510482239166
2005	65.48871776088379
2006	65.97754388498201
2007	66.31488675743067
2008	66.52856510011517
2009	67.02635761527289
2010	67.41546812353403
2011	67.89204568369529
2012	68.32010687508617
2013	68.74352861658406
2014	69.11076198551966
2015	69.45269490449276
2016	69.79706474898431
2017	70.13719708688964
2018	70.36859382667046
2019	70.61562392598276
2020	70.20058149108486
2021	68.49778652742107
2022	69.17397486885034