Year	years
1960	43.54772370847069
1961	44.77693942343279
1962	45.04649115024914
1963	45.81835788165576
1964	46.519811532824214
1965	47.12926685111152
1966	48.08047971831471
1967	48.49931094477638
1968	48.94955096918828
1969	49.51731577302037
1970	50.09468165356264
1971	50.800066794285506
1972	51.38828408841877
1973	51.794215437756584
1974	52.62403709483008
1975	53.138841588117884
1976	53.67828343443398
1977	54.94456764146791
1978	55.48410042183101
1979	56.58439796136183
1980	56.63629980645243
1981	56.06225490896267
1982	56.428416583124815
1983	57.944662351002165
1984	59.461029812986766
1985	60.21587042020724
1986	60.665326456748495
1987	61.5276225384533
1988	61.888225704022716
1989	63.18469886490046
1990	63.19054258324229
1991	64.37549582227608
1992	65.00110394120011
1993	65.35389125719011
1994	65.43123890899737
1995	65.74296078575571
1996	66.1012726402643
1997	66.35424343838774
1998	66.64203160646876
1999	67.03263813996786
2000	67.32094830177742
2001	67.6854376989284
2002	68.02984873232268
2003	67.86219152676688
2004	68.26423767601469
2005	68.52895220997465
2006	68.63130711003714
2007	68.99282181263689
2008	69.43078565557563
2009	69.84310374004826
2010	70.0811272128099
2011	70.33141458762931
2012	70.1790587361453
2013	70.21633351009262
2014	70.5171079665288
2015	70.83281139958662
2016	70.96616310223037
2017	71.36827964407516
2018	71.64244587646458
2019	71.86226926535632
2020	70.81257615741481
2021	70.63979644269978
2022	71.11852277019248