Year	years
1960	69.03760636121159
1961	69.43735429967667
1962	69.28127311203902
1963	69.64127047045216
1964	70.16091885718484
1965	70.27086513001301
1966	70.58235186087644
1967	70.58984419758461
1968	70.59593239055057
1969	70.42180243219781
1970	70.82235693055478
1971	70.96579800574396
1972	71.35053997894074
1973	71.46880376601514
1974	71.77990296055562
1975	71.79896674272506
1976	72.06914828579566
1977	72.3941776016688
1978	72.48511017675658
1979	72.76698494423339
1980	72.78960621699404
1981	73.125229633857
1982	73.40334558310505
1983	73.44889921351474
1984	73.74048172064761
1985	73.81547330955259
1986	74.07156470331138
1987	74.32453372535159
1988	74.52677694412273
1989	74.65464948234744
1990	74.69732687513049
1991	74.8099607606176
1992	75.12689288181278
1993	75.25540133964091
1994	75.52573652228679
1995	75.67124375556426
1996	75.92402182997611
1997	76.24187546867188
1998	76.51124162501134
1999	76.74520018887368
2000	77.07531688406453
2001	77.42295017489741
2002	77.53100329864203
2003	77.5893359969316
2004	78.11449989571591
2005	78.27142866781237
2006	78.668010036854
2007	78.9018190892451
2008	79.12529640987692
2009	79.35763602321676
2010	79.63003371246744
2011	80.13874214924849
2012	80.15765948612611
2013	80.46479376896012
2014	80.87198239658558
2015	80.5684394242096
2016	80.95129748073016
2017	80.92820864686587
2018	81.02872899908027
2019	81.31485796394043
2020	80.4508691329259
2021	80.31661322597562
2022	80.80262110738526