Year	years
1960	73.19229881530667
1961	73.67386538641604
1962	73.58153784775921
1963	73.49640090178937
1964	73.82326157903226
1965	73.9202370680128
1966	74.0336049642918
1967	74.42368813487677
1968	74.25351020220522
1969	74.54748939642913
1970	74.84283719349214
1971	75.15190087796867
1972	75.2355561686397
1973	75.44376307273579
1974	75.99536482655849
1975	76.65969210203511
1976	76.8749289455697
1977	77.27318847326164
1978	77.3971688408403
1979	77.8750705769623
1980	77.53295640497957
1981	77.93038257839157
1982	78.21445134348421
1983	78.24545199430949
1984	78.35614098125058
1985	78.35411636806475
1986	78.3613316605239
1987	78.4834845302667
1988	78.49226920350694
1989	78.69555918786878
1990	78.99051648196759
1991	79.0885627613329
1992	79.29375177867833
1993	79.00294091994736
1994	79.19148620441284
1995	79.10975058265736
1996	79.30203654944178
1997	79.58207614183392
1998	79.68775526989597
1999	79.61645682971444
2000	79.54647622482206
2001	79.74502687942345
2002	79.83714837527005
2003	79.94774755598598
2004	80.32786491131264
2005	80.33702250773344
2006	80.55563632582849
2007	80.82674544579118
2008	80.84036987877053
2009	81.13915825805309
2010	81.25099248198686
2011	81.35561390403413
2012	81.4605145260858
2013	81.4641121981428
2014	81.56063594476542
2015	81.46941769976578
2016	81.39455036863882
2017	81.39513925374776
2018	81.48407348413043
2019	81.7051153965213
2020	80.31652949251244
2021	79.78661690717027
2022	80.55314691671147