Year	years
1960	42.7231428623187
1961	43.195550285380165
1962	43.69148351398484
1963	43.846102463578276
1964	44.534336158763196
1965	44.55655299474613
1966	44.94214210945094
1967	45.51678944831293
1968	45.88256536874679
1969	46.138980968356044
1970	45.04983731145693
1971	42.292114215821805
1972	46.69505895703211
1973	47.255800304258806
1974	47.26268210835678
1975	47.306924438522536
1976	47.915195883400884
1977	48.58224602589514
1978	48.95038549774191
1979	49.41182161033092
1980	49.908030388165045
1981	50.200001295735056
1982	50.41478228792704
1983	49.94332067188398
1984	50.04692068786822
1985	50.397256963205535
1986	51.02299449517685
1987	51.588752923955745
1988	51.467387172958524
1989	52.35084302283997
1990	52.65378730861273
1991	52.37482821318062
1992	52.94832062994237
1993	53.413255217203925
1994	53.998811850833675
1995	54.41116179762028
1996	54.543363671766286
1997	55.17993948505876
1998	55.41284617862207
1999	56.608641036422945
2000	57.066160858641986
2001	57.515275925664085
2002	57.95028267622472
2003	58.453630548084476
2004	58.77345726241524
2005	59.387415914187734
2006	59.942639801517544
2007	60.34717017576683
2008	60.476374771829256
2009	61.327997604479144
2010	61.82756744921935
2011	62.47208474573782
2012	62.848514616804124
2013	63.19409575872412
2014	63.577512752047355
2015	63.95788920578941
2016	64.47164293263903
2017	64.87272864871503
2018	65.27719305985798
2019	65.64179339728979
2020	65.10590483040735
2021	64.74778514269326
2022	65.41607448651483