Year	years
1960	43.8163517628787
1961	44.34191986387283
1962	44.82638979586874
1963	45.18528722446418
1964	45.883454881041565
1965	46.07704967282792
1966	46.54663977437211
1967	47.108378298916236
1968	47.624829810966425
1969	47.985594546766
1970	47.44661259821745
1971	46.49626345748658
1972	48.99498362549128
1973	49.52221012642194
1974	49.592758388811376
1975	49.73069383767137
1976	50.31541217065768
1977	51.01444087712619
1978	51.52327626461199
1979	52.00965181683987
1980	52.47949588388435
1981	52.90178479642048
1982	53.20777198125393
1983	52.988440084826095
1984	53.25837914966352
1985	53.447235379512435
1986	53.838425388550874
1987	54.26360306893067
1988	54.2701210207091
1989	54.81192341262688
1990	55.071944979887576
1991	54.78132760659598
1992	55.12329514989963
1993	55.332049134147326
1994	55.59399732219755
1995	55.835113716083576
1996	55.94917897949036
1997	56.491625430279576
1998	56.810371653885
1999	57.681606176452256
2000	57.99949536848394
2001	58.38859612894696
2002	58.84451553170929
2003	59.33878162152614
2004	59.65668008014208
2005	60.15382936605125
2006	60.84997381915246
2007	61.2715798085772
2008	61.45041287526241
2009	62.20763866778255
2010	62.662982792470316
2011	63.28787857249645
2012	63.722385087828876
2013	64.2056258410915
2014	64.48140579228406
2015	64.82840424178272
2016	65.23848709330623
2017	65.65950635469851
2018	65.9828942826466
2019	66.34290527402939
2020	65.92411790269199
2021	65.61177218199411
2022	66.29753388015855