Year	years
1960	68.51941280291923
1961	68.78315471596764
1962	68.62486647877562
1963	69.21082318030318
1964	69.6812034964617
1965	69.66880707799766
1966	69.9313986737633
1967	69.8099881487572
1968	70.05625483422097
1969	69.80182177864775
1970	70.5297658307353
1971	70.82666776632524
1972	70.95463481470807
1973	71.0766814354988
1974	71.32641373430991
1975	71.21378218907292
1976	71.23732607208755
1977	71.39668519408725
1978	71.48604785182837
1979	71.49144427903954
1980	71.63163560963558
1981	71.92613075755823
1982	72.21416988491703
1983	72.23513333750994
1984	72.1288036676725
1985	72.29300493600792
1986	72.94557446309842
1987	73.07997307277748
1988	73.16381704016135
1989	73.39226160646197
1990	73.41760520511562
1991	73.13661455690175
1992	72.42106820902208
1993	72.05282122621693
1994	72.30710275796451
1995	72.27017054918318
1996	72.66453192514359
1997	72.97054267348638
1998	73.3277371170723
1999	73.0763950591216
2000	73.37513575863294
2001	73.52298167309114
2002	73.60843462360731
2003	73.74497348576205
2004	74.10711364564531
2005	74.21230932578317
2006	74.67133599011588
2007	75.0694099940438
2008	75.30082689569112
2009	75.72852844420807
2010	75.94894438819475
2011	76.37429972479835
2012	76.6650861164901
2013	77.05486457685465
2014	77.25999845665648
2015	77.40325719428162
2016	77.68758152234427
2017	77.99716512743136
2018	78.16029865407305
2019	78.4124124098163
2020	76.84552871624872
2021	75.89232914381077
2022	78.03891995524828