Year	years
1960	43.47608433744033
1961	48.59157458492817
1962	55.583016049885714
1963	56.135944556973776
1964	56.845611093208255
1965	57.05642207924823
1966	57.92026821905633
1967	58.71990679785229
1968	59.15637137234999
1969	59.774943200669874
1970	60.39499305097985
1971	61.170200689891544
1972	61.75451832361476
1973	62.60871915148481
1974	63.291541730438006
1975	63.976661180698024
1976	64.71725789257411
1977	65.47565080159323
1978	66.11924478062826
1979	66.71645075454613
1980	67.2100660486132
1981	67.68708780256058
1982	68.16987274506104
1983	68.58272568964291
1984	68.96521013322952
1985	69.33592866740075
1986	69.72240339585726
1987	70.0753184326756
1988	70.34079807690765
1989	70.66607842939992
1990	70.8389984012166
1991	70.902076227998
1992	71.42248214749608
1993	71.97574786794897
1994	72.15988429570781
1995	72.46476472233327
1996	72.71735845317833
1997	73.08946861668322
1998	73.57095955992463
1999	73.62955718881577
2000	74.07158521851213
2001	74.85866411650383
2002	75.16964129098103
2003	75.64042590454095
2004	75.68531690612919
2005	76.20133436472958
2006	76.5488235595134
2007	76.81324164209038
2008	76.71940512225758
2009	77.33094976641095
2010	77.50969073468153
2011	77.74772391862903
2012	78.03521449205736
2013	78.29890539221525
2014	78.53986663945689
2015	78.76569372590158
2016	78.98899679178095
2017	79.19706779145719
2018	79.48332142154678
2019	79.65921276034409
2020	79.70019893525942
2021	79.32843292592746
2022	79.71401487261012