Year	years
1960	71.72010822980994
1961	72.16945696593913
1962	72.07081347193856
1963	72.47638010561174
1964	73.05042767353275
1965	73.17483219050774
1966	73.53492433333916
1967	73.60362602861031
1968	73.6549313792411
1969	73.56150978233603
1970	73.97861460434983
1971	74.19658604189422
1972	74.58307004587098
1973	74.72706370601331
1974	75.07108992714251
1975	75.1511477038322
1976	75.45840581356201
1977	75.8544301256338
1978	75.97193931680586
1979	76.28607596525586
1980	76.34024021609095
1981	76.67132047646855
1982	76.94225411023116
1983	77.0065993521924
1984	77.32879753426849
1985	77.39355861918658
1986	77.62293872910708
1987	77.91227257863247
1988	78.11564525009062
1989	78.29227453316065
1990	78.36965615334181
1991	78.52317951317457
1992	78.85581765083744
1993	78.94250349563164
1994	79.22514644639408
1995	79.36745288751874
1996	79.55329428477198
1997	79.81496763252423
1998	80.0421704709726
1999	80.24220213111859
2000	80.51685994791944
2001	80.81582009130359
2002	80.89104416771669
2003	80.87594325447277
2004	81.41622880709535
2005	81.54778019734245
2006	81.94362153074285
2007	82.13063087275167
2008	82.285003370459
2009	82.50300304860937
2010	82.7533035682633
2011	83.27140826665658
2012	83.20301223470477
2013	83.4556481232342
2014	83.84833205852598
2015	83.45898300397333
2016	83.86328927756313
2017	83.74393165087127
2018	83.85312921331996
2019	84.10906228733766
2020	83.31787350372284
2021	83.19127069405403
2022	83.56339541647586