Year	years
1960	43.57484483354657
1961	46.36060407818238
1962	50.03892350793043
1963	50.503277362514595
1964	51.054334324602706
1965	50.83980559922884
1966	51.61594281773491
1967	52.169720668957034
1968	52.9190990827883
1969	53.427165818335546
1970	53.75676740600502
1971	53.855100636624506
1972	55.07439267421079
1973	55.75857818160699
1974	56.29472379978224
1975	56.917194863308985
1976	57.512601831403636
1977	58.136320330005695
1978	58.64321960716055
1979	59.17535173179309
1980	59.66522330610731
1981	60.104377558524476
1982	60.54166103753209
1983	61.00895655338226
1984	61.44083856332088
1985	61.81697695512791
1986	62.22557722740028
1987	62.570767210860986
1988	62.861279565539334
1989	63.20799248340011
1990	63.45145130643748
1991	63.659596539795274
1992	64.06330170437217
1993	64.35063984324464
1994	64.61679780933737
1995	64.91556622534692
1996	65.17685998736002
1997	65.5346955058372
1998	65.92518044856135
1999	66.25952838386291
2000	66.57910130623846
2001	66.98694213795129
2002	67.3266384056373
2003	67.6176650016246
2004	67.83598397184373
2005	68.24203005480102
2006	68.59078160878174
2007	68.83369390962429
2008	68.99334607899931
2009	69.39995868251815
2010	69.69903298348771
2011	70.04768670024653
2012	70.39012207745513
2013	70.72031646605271
2014	71.06156031478817
2015	71.35122673191223
2016	71.62125831090295
2017	71.84491110293627
2018	72.13679590540013
2019	72.32646783968639
2020	71.65389844807625
2021	70.5806218182162
2022	71.28790437006118