Year	years
1960	45.7004950866218
1961	46.05814441691074
1962	46.50294023407258
1963	46.771000487932
1964	47.171346550656615
1965	46.595038229333504
1966	47.06491110496215
1967	47.29215447922402
1968	48.31840436544759
1969	48.756814810931445
1970	48.758134247431514
1971	47.40178473555682
1972	49.765561796096804
1973	50.33961494673311
1974	50.76059529992396
1975	51.41989887119606
1976	51.90856973757106
1977	52.43510779150756
1978	52.83474609348525
1979	53.24659627665281
1980	53.72331680576292
1981	54.15298126925764
1982	54.49819148140632
1983	54.91811139197774
1984	55.30278959930449
1985	55.6826261011392
1986	56.062215919514806
1987	56.40487545068124
1988	56.7058510388666
1989	57.053531115326734
1990	57.4057116609511
1991	57.58136093134259
1992	58.00182031018763
1993	58.27599193572929
1994	58.57936256625589
1995	58.899293029546456
1996	59.204345434533835
1997	59.547327472700935
1998	59.96707429238551
1999	60.44426754528628
2000	60.71679787738498
2001	61.019705081176234
2002	61.39250036707752
2003	61.72568378801816
2004	61.999852120213575
2005	62.31922041657946
2006	62.65470642306002
2007	62.878160310631955
2008	63.03978479028612
2009	63.42861983466207
2010	63.7751369933572
2011	64.1857247213634
2012	64.5823981374849
2013	64.98283985292782
2014	65.47010619073609
2015	65.91058785196033
2016	66.32486599354223
2017	66.63230580643521
2018	66.88094450684417
2019	67.04806667153234
2020	66.41952727755199
2021	64.7145443910331
2022	65.35288939323226