Year	years
1960	40.133164447468886
1961	44.51634210313563
1962	50.39217541182566
1963	51.00152697722959
1964	51.63337313036675
1965	51.46999992144842
1966	52.600717855685986
1967	53.35599558339627
1968	53.89937652809353
1969	54.45094655392598
1970	55.06383602475866
1971	55.9095664581919
1972	56.57283593088269
1973	57.30304013230171
1974	57.84495750066616
1975	58.41643625781761
1976	59.074361472760835
1977	59.64988034985616
1978	60.144067995985125
1979	60.6966417316447
1980	61.1209383580652
1981	61.47988090351206
1982	61.95123340229651
1983	62.42279186067018
1984	62.92532911927254
1985	63.32659878775123
1986	63.75302431720017
1987	64.08761416001839
1988	64.33058331420851
1989	64.7159893922587
1990	64.88389854071553
1991	65.2561807859693
1992	65.6179566402224
1993	65.90909756902498
1994	66.26689331701617
1995	66.54641408817683
1996	66.86557527715968
1997	67.22938066512042
1998	67.57497527976493
1999	67.89667761660604
2000	68.20317469075805
2001	68.55218564319986
2002	68.88418071180357
2003	69.10868163852925
2004	69.29851697557007
2005	69.74180954715125
2006	70.0542229461678
2007	70.28626981648837
2008	70.49545123255093
2009	70.88377452738399
2010	71.15529970523556
2011	71.44096579654538
2012	71.71198261561436
2013	71.98420937192343
2014	72.26785022249743
2015	72.46597658952581
2016	72.58220228160816
2017	72.64969765667159
2018	73.08151049554249
2019	73.29247025166296
2020	72.40551042573075
2021	72.09202677382198
2022	72.99842646768823