Year	years
1960	46.87924373002273
1961	47.36552010069314
1962	47.78955193594714
1963	48.187870192688365
1964	48.67069859753771
1965	47.67966965957857
1966	48.66999299279224
1967	49.351341735587646
1968	50.39951896113923
1969	50.82211653786133
1970	50.76912136670321
1971	50.17385023376906
1972	52.00236801328244
1973	52.46361125010737
1974	52.92345177697767
1975	53.34744147268391
1976	53.884096032352986
1977	54.48752497735027
1978	54.979059155929534
1979	55.566752730975075
1980	56.11721526462516
1981	56.552845776686496
1982	57.04267189772011
1983	57.47965669108171
1984	58.05158193410242
1985	58.56658362740718
1986	59.0327601714472
1987	59.62241645794228
1988	60.0273415491619
1989	60.4662865938715
1990	60.827546768003224
1991	61.13543152097143
1992	61.620556411047566
1993	61.90135379122169
1994	62.157122558846964
1995	62.567320578379544
1996	62.87675609854077
1997	63.28436259172625
1998	63.710093816218645
1999	64.14361299881068
2000	64.49925708264554
2001	64.81635498567248
2002	65.22265490825167
2003	65.5196872923742
2004	65.74290199128544
2005	66.19150348399546
2006	66.59202958293525
2007	66.88471173174285
2008	67.07969004891606
2009	67.52799847782806
2010	67.86597309302013
2011	68.29176977443531
2012	68.67255327145207
2013	69.06532039554399
2014	69.48499150776087
2015	69.87120791586221
2016	70.21638780904509
2017	70.53844903119081
2018	70.79482502646407
2019	71.01473888400355
2020	70.02869341387866
2021	68.46604059199917
2022	69.3164374718329