Year	years
1960	67.47818369731247
1961	67.7506233291407
1962	67.624415009034
1963	67.95874723916727
1964	68.48063542173296
1965	68.4655231136565
1966	68.65290858702693
1967	68.66295934495814
1968	68.64020173667498
1969	68.43452353411466
1970	68.91063592614717
1971	69.10712082407656
1972	69.33052771057396
1973	69.44794548151614
1974	69.66369565455079
1975	69.61719083633281
1976	69.74442315757547
1977	69.9531282739114
1978	70.02507752097647
1979	70.13910040413626
1980	70.27080071804876
1981	70.55895169736282
1982	70.86508632347922
1983	70.90824866423719
1984	71.03059099749464
1985	71.2303995279343
1986	71.80311677758156
1987	72.02685069551795
1988	72.11514554431297
1989	72.23999254133385
1990	72.2257582064448
1991	72.1691378524204
1992	71.8906282124852
1993	71.53252982329641
1994	71.70356812512873
1995	71.79540250002701
1996	72.22514883184041
1997	72.63049910982583
1998	72.93990825912984
1999	72.88942797581014
2000	73.13222407214532
2001	73.39272537324324
2002	73.50306429159723
2003	73.61361044070284
2004	74.05467488354395
2005	74.1948289353497
2006	74.69334106292747
2007	75.05155897889593
2008	75.31299456894612
2009	75.70186847610314
2010	75.98653084553375
2011	76.45826323775073
2012	76.64226646799155
2013	76.98445179191556
2014	77.29442243562951
2015	77.2288167304908
2016	77.56267943400731
2017	77.7731288262557
2018	77.90651244772909
2019	78.18050698573892
2020	76.95248812517556
2021	76.66642379017874
2022	77.84131870047587