Year	years
1960	44.75757282276755
1961	46.01085717967032
1962	46.32154250059715
1963	46.90786896475521
1964	47.58556125954767
1965	48.1975181930748
1966	49.22496593823633
1967	49.699264935943006
1968	50.135277226841644
1969	50.74679270204952
1970	51.34092912053077
1971	52.03600788907809
1972	52.60734961139467
1973	53.22151330996821
1974	54.03670936596042
1975	54.6619913311596
1976	55.144926380066224
1977	56.410653022185194
1978	56.976034194738986
1979	58.16529368015021
1980	58.571006086000935
1981	58.51532629607877
1982	59.001418175798754
1983	60.489710581160224
1984	61.72761541209349
1985	62.50182378573197
1986	63.05920152772657
1987	63.75486513605023
1988	64.12067868021416
1989	65.0399400257224
1990	65.06327204704543
1991	66.20223153395962
1992	66.77198292474341
1993	67.10089979739686
1994	67.29543630643833
1995	67.60745660242813
1996	67.99366757342185
1997	68.26159417365092
1998	68.49643095507962
1999	68.91939520418148
2000	69.28217806821041
2001	69.63113154032241
2002	69.97659245243484
2003	69.8601811862713
2004	70.33843986271532
2005	70.6309307908833
2006	70.84028813735318
2007	71.18035916020979
2008	71.46639113422114
2009	71.81980690706668
2010	72.10638331940117
2011	72.37228523104382
2012	72.28467802462883
2013	72.3442426683639
2014	72.62386339011542
2015	72.88951608401229
2016	73.15252184269133
2017	73.60974285409922
2018	73.8115171255443
2019	73.95911501119359
2020	72.94976833193155
2021	72.745678008424
2022	73.21126324947248