Year	years
1960	39.384638019324186
1961	39.704283881083626
1962	39.93535409468969
1963	40.283468313297206
1964	40.60988778003836
1965	40.844938396609116
1966	41.0360980419449
1967	41.003497820107896
1968	41.571927610043645
1969	41.79031334249522
1970	42.21369592163326
1971	42.6780206358183
1972	43.366275273519356
1973	43.92174339112007
1974	44.57037487145394
1975	45.31772744936131
1976	46.18790314430762
1977	46.96862277692277
1978	47.59242513405598
1979	48.00405722094504
1980	48.371227166396075
1981	48.60773305436053
1982	48.85878080892795
1983	49.117079620235685
1984	49.26131100156483
1985	49.39985629914762
1986	49.419545402508604
1987	49.73379940168596
1988	49.9586585534944
1989	50.14994578240085
1990	50.22901108639938
1991	50.16276386664746
1992	50.25557713843648
1993	50.3293033050882
1994	50.13066979838855
1995	50.232828067209795
1996	50.34940604717133
1997	50.50699538331107
1998	50.59224593680659
1999	51.00462819086272
2000	51.38252845554541
2001	51.676469048247284
2002	52.033916055639715
2003	52.52457948349551
2004	52.8903120879728
2005	53.39750452427889
2006	53.831594486257075
2007	54.24670473266834
2008	54.53774553806404
2009	55.077111186288384
2010	55.44060716898044
2011	55.92535594650018
2012	56.26070880302735
2013	56.61726350031962
2014	56.8809346833537
2015	57.16432389233239
2016	57.44860099512283
2017	57.842236001278856
2018	58.11324771678102
2019	58.545979044689304
2020	58.34623978556962
2021	58.099827740224086
2022	58.717472285813976