Year	years
1960	66.49132718838817
1961	66.84347470856835
1962	66.63138294608021
1963	66.94814916815554
1964	67.4157960571476
1965	67.51127640878762
1966	67.77615574159515
1967	67.72498520667308
1968	67.68787498383098
1969	67.43718765308252
1970	67.82176810039408
1971	67.89337613594986
1972	68.27706728711868
1973	68.37026118775874
1974	68.65725603059063
1975	68.61076086394613
1976	68.84503359697706
1977	69.10177435220443
1978	69.1678704224972
1979	69.4186269308555
1980	69.4115089411729
1981	69.75146917234017
1982	70.03652087454185
1983	70.06408776971743
1984	70.32584961039632
1985	70.40999336676427
1986	70.69094526566879
1987	70.90937374061507
1988	71.11087240788181
1989	71.1930158776079
1990	71.20366018052964
1991	71.27851321312235
1992	71.58180177056279
1993	71.75152316614974
1994	72.0113320956274
1995	72.1597852087045
1996	72.47556134052425
1997	72.84753343963304
1998	73.15736592621927
1999	73.42384647989815
2000	73.80659604681853
2001	74.20123956042606
2002	74.34104534982167
2003	74.46903631639042
2004	74.98009005062156
2005	75.1623352793022
2006	75.55994928779138
2007	75.83864575620616
2008	76.12803164451985
2009	76.37343300961406
2010	76.66701696259376
2011	77.16706490633476
2012	77.26907930537396
2013	77.62793746103121
2014	78.049480532526
2015	77.8275364082164
2016	78.1902182462582
2017	78.25890913286294
2018	78.35146684820278
2019	78.66590540503836
2020	77.73317288321088
2021	77.59144669143156
2022	78.18514670793152