Year	years
1960	70.19397160058537
1961	70.63204657673026
1962	70.69241725232628
1963	70.98571776174792
1964	71.50786844208541
1965	71.66183999804161
1966	71.97383326319512
1967	72.3310643373004
1968	72.33789476983107
1969	72.48734949813542
1970	72.75324256143308
1971	73.09501351014512
1972	73.38028937436174
1973	73.59265184426822
1974	73.98951506438038
1975	74.35735145384895
1976	74.65076379347516
1977	75.11817953668543
1978	75.32572921247487
1979	75.71280394185187
1980	75.74410118448058
1981	76.11539104611228
1982	76.4516666406393
1983	76.57780267285393
1984	76.90202727275205
1985	76.96881389705571
1986	77.27266943497007
1987	77.5702156210481
1988	77.71870788983259
1989	77.97837301134535
1990	78.18364345448958
1991	78.375386374348
1992	78.64005825193279
1993	78.69372815061266
1994	78.9875515932244
1995	79.04379140032039
1996	79.32878847319608
1997	79.60828467628171
1998	79.76386899757435
1999	79.8120526057524
2000	80.08435579583818
2001	80.32999960106262
2002	80.46635372537861
2003	80.55231620506811
2004	80.92549582196865
2005	81.01382737068774
2006	81.2829906342577
2007	81.47306580268864
2008	81.58735675412167
2009	81.82732409989289
2010	81.96935339929124
2011	82.18598206481795
2012	82.2963413477037
2013	82.46262823156465
2014	82.6972743504068
2015	82.54731000530522
2016	82.67701257628114
2017	82.66950134193902
2018	82.75458177135003
2019	82.97838193531233
2020	81.86804991140065
2021	81.7015519298761
2022	82.40924257777789