Year	years
1960	68.86566601735709
1961	69.27412697327944
1962	69.23870068050942
1963	69.4413611052855
1964	69.92568616256374
1965	69.99542683543254
1966	70.21880251051464
1967	70.52362707352289
1968	70.35578769808014
1969	70.48224842609325
1970	70.7474216050012
1971	71.05122673722178
1972	71.25444434523021
1973	71.42484610590058
1974	71.78698934826012
1975	72.09495959322045
1976	72.36560431979574
1977	72.75000271187362
1978	72.89221309643005
1979	73.21292959790352
1980	73.24646880437938
1981	73.58769174270132
1982	73.91919738125279
1983	74.0154835542724
1984	74.28087952622623
1985	74.40277437053996
1986	74.72321321617122
1987	75.01057177782027
1988	75.11279520285643
1989	75.3524446937252
1990	75.46730731470342
1991	75.59403655248548
1992	75.70998902280702
1993	75.72228268380715
1994	76.03881249339624
1995	76.05965181487625
1996	76.4372898317012
1997	76.77489596802829
1998	76.99081498628402
1999	77.09723800997338
2000	77.34935177883399
2001	77.6440001289902
2002	77.79615349589939
2003	77.90922371271722
2004	78.33916304427439
2005	78.42641969889779
2006	78.75864735159549
2007	79.00585142774668
2008	79.15085842632047
2009	79.47560957572237
2010	79.6850584909436
2011	79.950319503711
2012	80.08367150187557
2013	80.2602095768695
2014	80.51571186995783
2015	80.38174734992552
2016	80.53913304542685
2017	80.58339260454898
2018	80.67013971213846
2019	80.89804374390012
2020	79.99832138844593
2021	79.73794490511257
2022	80.16761519140215