Year	years
1960	64.5582415101558
1961	64.9713325638107
1962	64.94560408245682
1963	65.09255832787815
1964	65.50319885091054
1965	65.61901002416847
1966	65.82441134942403
1967	66.10703040464352
1968	65.88354176461475
1969	66.041822246922
1970	66.33628065643035
1971	66.59056628953495
1972	66.82341491833465
1973	66.98678745182016
1974	67.37411134490505
1975	67.6134896402347
1976	67.87049660784264
1977	68.22782745098746
1978	68.37096504702417
1979	68.69824011148845
1980	68.80288039555778
1981	69.2011328549001
1982	69.56863050272959
1983	69.71802461493836
1984	70.0125192997659
1985	70.11872022457388
1986	70.45457050072585
1987	70.74323060491153
1988	70.87752784592251
1989	71.09956345779543
1990	71.20737684220428
1991	71.3993077146659
1992	71.67504839858016
1993	71.82145252746281
1994	72.10234919936012
1995	72.22292730993429
1996	72.67687451479756
1997	73.0628186752775
1998	73.30816327253973
1999	73.48595506308057
2000	73.89149352574806
2001	74.2163118854663
2002	74.42666608178739
2003	74.59018600658193
2004	75.00150532867411
2005	75.13799307558638
2006	75.43852825464448
2007	75.66170071544909
2008	75.84780445148053
2009	76.13274372342295
2010	76.33398814571034
2011	76.57179163291157
2012	76.76680171978995
2013	76.99055104886223
2014	77.25200332469083
2015	77.15212143312347
2016	77.25003655343207
2017	77.30795332160348
2018	77.37992473542846
2019	77.58129053484528
2020	76.09045741780183
2021	75.8029380186234
2022	76.96294400805455