Year	years
1960	53.033929595941366
1961	53.5675026503092
1962	54.00462010289061
1963	54.41907095497933
1964	54.90603864749979
1965	55.25596291670395
1966	55.67789499539063
1967	56.046794473470406
1968	56.398054577559996
1969	56.7351388183295
1970	56.831374668985994
1971	57.57385522344595
1972	57.90013353785445
1973	58.401813578761406
1974	58.81665772453342
1975	59.28102816530213
1976	59.4869848000215
1977	59.94777413667709
1978	60.24946223234798
1979	60.5536231133381
1980	60.969517283730475
1981	61.4053848860379
1982	61.70092801452073
1983	62.268351346513775
1984	62.662248967827296
1985	63.02614311584132
1986	63.57742400148757
1987	63.959977157737384
1988	64.35107202779338
1989	64.61736036216747
1990	64.80132520091954
1991	65.13153305776702
1992	65.44495596482874
1993	65.75224116353697
1994	66.15067847272597
1995	66.42679240729542
1996	66.80346664280694
1997	67.15441559521383
1998	67.43482746217563
1999	67.82645112522039
2000	68.03337855082769
2001	68.2743362972536
2002	68.63923351544241
2003	68.89394087619756
2004	69.2030756419444
2005	69.60043648219539
2006	69.81021271804673
2007	69.95423474716405
2008	70.1870985922257
2009	70.4090178704184
2010	70.31848917430489
2011	70.80267829899799
2012	71.00934495636179
2013	71.30562424076817
2014	71.54183140931468
2015	71.56110720348259
2016	71.46214057162534
2017	71.68474662465204
2018	71.77989868934326
2019	71.95428487524686
2020	69.67003212114447
2021	68.8040106136205
2022	70.64912698818006