Year	years
1960	70.45292333155535
1961	70.81991867843604
1962	70.30791355219736
1963	71.34723895740863
1964	71.83582846954673
1965	72.00906221606556
1966	72.59968302943618
1967	72.22448116941392
1968	72.57682153248548
1969	72.18686245707771
1970	72.49465322513156
1971	72.79601604008258
1972	73.18131212440964
1973	73.36554530272592
1974	73.57191117707477
1975	73.52358445834506
1976	73.7346046968173
1977	73.76358272269083
1978	73.70563324407931
1979	73.88248198085611
1980	73.63795651239676
1981	74.11488846348627
1982	74.20021946775023
1983	74.22959365071306
1984	74.22312461435597
1985	74.19305736988865
1986	74.4034833483463
1987	74.48485512363992
1988	74.75570401769428
1989	74.74200141106479
1990	74.82008501249983
1991	74.78948063393737
1992	75.02141420014428
1993	75.13413251208284
1994	75.218158026532
1995	75.38599399506198
1996	75.58001093130076
1997	75.74467859319256
1998	76.09317811082734
1999	76.35029201024477
2000	76.78198584992613
2001	77.13299876250287
2002	77.33469012836359
2003	77.45942701255464
2004	77.80755792555651
2005	77.95451134549121
2006	78.19452113722785
2007	78.31620950413404
2008	78.6222117694103
2009	78.95236426078844
2010	79.28209251525347
2011	79.90167169805838
2012	79.93032476782145
2013	80.20537524281768
2014	80.51857268855508
2015	80.3718095085265
2016	80.82208746581931
2017	80.69352222808617
2018	80.78099185641872
2019	81.01607963444242
2020	79.97412583453853
2021	78.62685892593231
2022	80.56018904720163