Year	years
1960	45.32237092412279
1961	47.75198424480284
1962	50.895592755926586
1963	51.33925806941083
1964	51.882104358188
1965	51.66966773579028
1966	52.32107054063957
1967	52.795062666591924
1968	53.45605276924298
1969	53.850361210881566
1970	54.207542864010996
1971	54.31697784563955
1972	55.354252806526624
1973	55.98904137251252
1974	56.45884931103066
1975	56.977921174782395
1976	57.51970497456922
1977	58.07001917547112
1978	58.515181077381364
1979	58.9861257653212
1980	59.418556884108504
1981	59.837938328634564
1982	60.239979420173256
1983	60.550705099474484
1984	60.887805376902215
1985	61.25565781499784
1986	61.7200654139376
1987	62.0608360982406
1988	62.280036368454375
1989	62.66616619235562
1990	62.86162672606406
1991	63.02093521574343
1992	63.30253812946258
1993	63.53058435223464
1994	63.793633903582545
1995	64.08096464208064
1996	64.34262069313364
1997	64.70856081425545
1998	65.02395839260767
1999	65.3663640105662
2000	65.70521492206643
2001	66.0855327295897
2002	66.40813923539177
2003	66.68929468947516
2004	66.92568714520947
2005	67.32225460923436
2006	67.71744148478274
2007	67.99619093192038
2008	68.17977979836434
2009	68.60358003237982
2010	68.90068032557355
2011	69.26983781107349
2012	69.58601330976376
2013	69.9111983022149
2014	70.23668228328329
2015	70.52367906168509
2016	70.80521339643148
2017	71.04228778116092
2018	71.32139442455141
2019	71.52543836924971
2020	70.82171877124978
2021	69.7899671680861
2022	70.511910539194