Year	years
1960	42.29965553186857
1961	44.83717450930028
1962	48.17992536864728
1963	48.616751864491434
1964	49.156658815085976
1965	48.83937300316741
1966	49.62928811793648
1967	50.17189608121249
1968	50.90139009075543
1969	51.3929534364962
1970	51.74690999805753
1971	51.69353003313585
1972	52.98010114358677
1973	53.64895171554079
1974	54.11242240034206
1975	54.69191224889845
1976	55.26853634855807
1977	55.79349996639663
1978	56.21035518872754
1979	56.68126556611739
1980	57.10290569012954
1981	57.46574194823195
1982	57.83680433502171
1983	58.15919036500319
1984	58.53459978920066
1985	58.910129796806494
1986	59.32144220803312
1987	59.664662445149446
1988	59.86961262797877
1989	60.312956323740856
1990	60.52500650346736
1991	60.78043165869443
1992	61.10914826077281
1993	61.40022365332809
1994	61.748257158701456
1995	61.978175022050074
1996	62.248907180353775
1997	62.585611903470095
1998	62.85968206246633
1999	63.2966393468946
2000	63.63784928541805
2001	63.954565975490254
2002	64.28430775985917
2003	64.59134690993778
2004	64.8133158975438
2005	65.18070840608938
2006	65.5189144232952
2007	65.750411312238
2008	65.94002915029601
2009	66.32267459710978
2010	66.6219387392832
2011	66.96018946538022
2012	67.25327576145008
2013	67.56001108970126
2014	67.92309925063587
2015	68.2247761038965
2016	68.48776363516922
2017	68.67317072229984
2018	68.98150567842588
2019	69.17251681936226
2020	68.42058398150388
2021	67.40794505480652
2022	68.11256842812948