Year	years
1960	42.383892629137414
1961	42.74432071771633
1962	43.098002107123534
1963	43.32223905136244
1964	43.853790108522894
1965	44.01685203805457
1966	43.89304275259955
1967	44.57140896392715
1968	44.89833571571205
1969	45.182683534349934
1970	45.494036810267964
1971	45.883432926473574
1972	45.66127500705391
1973	46.33939134010709
1974	46.3592792272195
1975	46.732000463177854
1976	47.48509806388399
1977	47.876428755746275
1978	48.16033151802715
1979	48.61191544399059
1980	49.00385283797429
1981	49.32629046736276
1982	49.61087353157509
1983	48.41468113563983
1984	48.486812898893156
1985	48.79695794775239
1986	49.581328129587284
1987	50.47193901896843
1988	50.27353835454087
1989	51.10459038856759
1990	51.20231532910359
1991	51.03796127690928
1992	51.038880727658636
1993	51.58910712802778
1994	51.77247540786901
1995	52.356355506336726
1996	52.47727709212634
1997	52.805639365232416
1998	52.81849855730205
1999	53.60603194538354
2000	54.097068164575866
2001	54.533550881164096
2002	55.024094120843216
2003	55.61800591379254
2004	56.133524854907066
2005	56.85530188197141
2006	57.67825176087323
2007	58.40292894008173
2008	59.05935485540774
2009	59.87241604651599
2010	60.22501750502858
2011	61.22677376910511
2012	61.902701364619475
2013	62.58673042593933
2014	63.11675020828696
2015	63.63866727726479
2016	64.2490089798582
2017	64.64449467167111
2018	65.12106924161023
2019	65.55023100856518
2020	65.04347979538213
2021	64.67721008303958
2022	65.19967952606513