Year	years
1960	64.87610928210144
1961	65.19862746767326
1962	65.34632666760065
1963	65.8331122064259
1964	66.22287589199642
1965	66.32993146901593
1966	66.5108649796729
1967	66.74204068566354
1968	66.98840164874241
1969	67.09581327869714
1970	67.2626168637237
1971	67.56168815898546
1972	67.82558742984187
1973	68.05458807022232
1974	68.33462878498068
1975	68.61599407338781
1976	68.73933153043004
1977	69.00626852116282
1978	69.21210324255745
1979	69.34349207974068
1980	69.81411498211607
1981	70.06231833274114
1982	70.32941725766767
1983	70.5214747314393
1984	70.68127706650526
1985	70.85486223846841
1986	71.43294896512015
1987	71.72931556128896
1988	71.61266156774033
1989	72.2328088813128
1990	72.28509401840242
1991	72.14603538169243
1992	71.87289390307508
1993	71.61395242052332
1994	71.72351065255717
1995	71.69341415394891
1996	71.93250258883916
1997	72.21465767631071
1998	72.59566137154964
1999	72.49155542982624
2000	73.04911333155849
2001	73.3111835843296
2002	73.60056318467564
2003	73.85725478430604
2004	74.12484224220849
2005	74.19731676473619
2006	74.46363343826364
2007	74.75827222671401
2008	74.97923244254117
2009	75.36529796298773
2010	75.64090272774496
2011	75.81530246299815
2012	76.22802043300403
2013	76.6164192208087
2014	76.84289207410491
2015	76.99313248554171
2016	77.20278913798866
2017	77.47861462326904
2018	77.66800734842637
2019	77.87160635231312
2020	76.30887835351845
2021	76.07421513341396
2022	77.571300031632