Year	years
1960	53.41462931889417
1961	53.8831179490288
1962	54.470266685622605
1963	55.00004988968223
1964	55.1769643496463
1965	56.09117377803572
1966	56.470860943702114
1967	56.96681251552376
1968	57.31894005295565
1969	57.44837444483622
1970	57.80156911506187
1971	58.11648252940478
1972	58.31664394423881
1973	58.23422388798241
1974	58.8035592471844
1975	58.81533306291091
1976	59.32271235962696
1977	59.54244991782687
1978	59.947063671712264
1979	60.30070084285991
1980	60.451616825778395
1981	60.662981914676955
1982	60.84330421906536
1983	61.208423976608195
1984	61.615391308601374
1985	62.03484898801026
1986	62.124557092197314
1987	62.412163771194585
1988	62.73166576536528
1989	62.925726495620445
1990	63.18682114046768
1991	63.43049553508259
1992	63.662662700463365
1993	63.88373626048147
1994	64.09378700101792
1995	64.3526788945778
1996	64.5996881506545
1997	64.75638723737954
1998	64.94762379738425
1999	65.04968502064119
2000	65.05558104111994
2001	65.21961919512952
2002	65.07173857150693
2003	65.41147871596351
2004	65.61905274403233
2005	65.7840146985193
2006	65.99889054266608
2007	66.01925835964894
2008	66.159110268139
2009	66.09565935673916
2010	66.44975243774049
2011	66.57196841174624
2012	66.6918943577056
2013	66.70204350495108
2014	66.72908769513391
2015	66.62960266816836
2016	66.94670724400694
2017	67.23817113704425
2018	67.33944737632376
2019	67.43267994828675
2020	67.52190909345457
2021	67.30694863335644
2022	67.79018910256653