Year	years
1960	56.86465866497022
1961	57.27841853496934
1962	57.80765989852569
1963	58.013029966842474
1964	58.58586035678651
1965	59.226443739854496
1966	59.50379604243297
1967	59.782573479616
1968	60.07009535825693
1969	60.247332276249516
1970	60.61631512355745
1971	60.895835286812556
1972	61.19168708576344
1973	61.44619851912587
1974	60.76527838234529
1975	61.14450874229621
1976	61.52576364070261
1977	61.73697742832019
1978	61.79889127356378
1979	62.089385521557126
1980	62.72465944950435
1981	63.02381316314044
1982	63.28586059229385
1983	63.524354242349645
1984	64.02188404125911
1985	64.30662256183413
1986	64.58714945277993
1987	64.98771403834934
1988	65.24797617288412
1989	65.79552326140002
1990	65.91177214105629
1991	65.96580668706103
1992	66.0338725141068
1993	66.1812534634853
1994	66.01564703454858
1995	66.15655932779197
1996	66.40835703069759
1997	66.44304291234319
1998	66.40823717241523
1999	66.29736650603927
2000	67.21507371114718
2001	67.43925743577243
2002	67.54299776602845
2003	67.73386841739246
2004	68.0104522277905
2005	68.3086990510631
2006	68.62130838419762
2007	68.97895157779527
2008	69.35118421875052
2009	69.72013657992471
2010	70.19381162653578
2011	70.50948128113215
2012	70.83308164349344
2013	71.17370558901608
2014	71.45436765339079
2015	71.73742744338064
2016	72.06530972093037
2017	72.41399843804297
2018	72.6308564795014
2019	72.75062706426235
2020	72.54059803701163
2021	71.6444984379684
2022	72.16452552417641