Year	years
1960	36.30122141847951
1961	41.68908465427287
1962	49.12405861307014
1963	49.61290354200674
1964	50.31837483893168
1965	50.01508394266792
1966	51.375194635169144
1967	52.26971117080447
1968	52.735554815873364
1969	53.456456257534526
1970	54.14819259473882
1971	55.03914850043419
1972	55.60827289951089
1973	56.533949492808325
1974	57.093803682490645
1975	57.88500546677664
1976	58.7261431960772
1977	59.42983546213187
1978	60.01443573085967
1979	60.61921438622123
1980	61.15352549758095
1981	61.65684549499006
1982	62.12680976774286
1983	62.51748619077803
1984	62.92340057396075
1985	63.2986643648422
1986	63.605279763647154
1987	63.9495878094147
1988	64.2075455185606
1989	64.53015469423033
1990	64.78857337544204
1991	65.16920792374572
1992	65.64170324782027
1993	66.01029136521235
1994	66.36959927627204
1995	66.62687699693292
1996	66.92256326804822
1997	67.31441875098687
1998	67.64789234742422
1999	67.99094249043415
2000	68.31252426375121
2001	68.68128955939719
2002	69.04922619672979
2003	69.43950120801296
2004	69.57244460290413
2005	70.05831589728376
2006	70.40754476164891
2007	70.62919460051732
2008	70.64013524037175
2009	71.10769280517671
2010	71.35035518847161
2011	71.6074154164697
2012	71.82292370864815
2013	72.04984163858553
2014	72.31150540453157
2015	72.51962544024914
2016	72.68097199917729
2017	72.6288528507143
2018	73.10947939821179
2019	73.33016592143096
2020	73.20046074677393
2021	72.82485121210543
2022	73.53240854126666