Year	years
1960	39.85606735535527
1961	40.14182908422675
1962	40.65319092815938
1963	40.938064338546894
1964	41.38030057261757
1965	41.54163267399007
1966	41.775967920777134
1967	41.81410762767292
1968	42.34081340452971
1969	42.6393372796769
1970	43.199400197146794
1971	43.8150815682265
1972	44.1169464473273
1973	44.985131460122595
1974	45.419197581624076
1975	45.86477198575972
1976	46.45769799290285
1977	47.008695715993866
1978	47.28835338236283
1979	47.630776726597716
1980	47.77564171165028
1981	48.037607414840714
1982	48.20014535382841
1983	47.97832133742723
1984	47.74843907666038
1985	47.894678330090535
1986	48.41844319898444
1987	47.978546330554806
1988	47.538169886863976
1989	48.68847961037613
1990	48.72872621177603
1991	48.64986201162135
1992	48.56316302137059
1993	49.057588197397074
1994	49.90104942388661
1995	49.71632546157431
1996	49.72926762911527
1997	49.970104707669805
1998	49.63320214860726
1999	50.7283999451106
2000	51.473936000652195
2001	51.9215614271429
2002	52.368116135500856
2003	52.88379279020072
2004	53.339801647140824
2005	53.93977917223587
2006	54.578575353319906
2007	55.08678013802482
2008	55.613654377498584
2009	56.30800351254707
2010	56.811968283324376
2011	57.38710651746939
2012	57.86979270053935
2013	58.330059291371185
2014	58.752196541557815
2015	59.119371262141314
2016	59.52391506277527
2017	59.95061134692821
2018	60.35483877540976
2019	60.7216573709725
2020	60.249531838873345
2021	59.87258063232004
2022	60.50302117203396