Year	years
1960	43.41506249275055
1961	46.04142908192899
1962	49.50146708790524
1963	49.94618767203265
1964	50.50387469171235
1965	50.30683814001259
1966	51.02183237360006
1967	51.58853610705107
1968	52.31311462098448
1969	52.80672824473408
1970	53.135939968928454
1971	53.25840521617048
1972	54.383449676666515
1973	55.07021927250815
1974	55.57473693250409
1975	56.17156619472354
1976	56.770972311121014
1977	57.37178773167856
1978	57.855119682816884
1979	58.37570820879403
1980	58.85475536797934
1981	59.28095358800471
1982	59.692963770660796
1983	60.03741245099396
1984	60.42165628224499
1985	60.79356051378365
1986	61.22729644377464
1987	61.59348261622924
1988	61.82669585231535
1989	62.25482448466325
1990	62.48021371042564
1991	62.66778271305544
1992	63.024405864312484
1993	63.33643385046774
1994	63.62470503947559
1995	63.869886375177806
1996	64.10841585962983
1997	64.46213355848434
1998	64.7777100608117
1999	65.16835217110439
2000	65.52769384313012
2001	65.93218125490579
2002	66.26808451478166
2003	66.60857956526459
2004	66.8346393807025
2005	67.24236484049655
2006	67.61849866305356
2007	67.8839073410554
2008	68.06588486244918
2009	68.48634511059687
2010	68.79079388049685
2011	69.14772900732018
2012	69.46981939852634
2013	69.7932388843787
2014	70.12815074030104
2015	70.41620365696785
2016	70.69783945147576
2017	70.92714873111596
2018	71.21367254090613
2019	71.41327999189957
2020	70.74702272635724
2021	69.72408438296294
2022	70.39558704146918