Year	years
1960	46.22789132098803
1961	46.54233098338957
1962	46.88527694324949
1963	47.187179156833324
1964	47.69949531899309
1965	47.807094707005014
1966	47.777304026955306
1967	48.01519102770275
1968	48.44030123979095
1969	48.542218831156276
1970	48.92553698087063
1971	49.50009731007087
1972	49.50700378935333
1973	50.103297980453526
1974	50.23734077964083
1975	50.484002715741326
1976	50.947728339706366
1977	51.47797304369472
1978	51.60926316385559
1979	51.85304977037558
1980	52.07609251920815
1981	52.209476258461656
1982	52.188225280840385
1983	51.58250837359558
1984	51.434756934589075
1985	51.608280044030145
1986	52.2318694997475
1987	52.679929722592256
1988	52.2507895423155
1989	53.28316471692036
1990	53.30253431575152
1991	53.30873661822025
1992	53.281669542089084
1993	53.67282525079816
1994	54.28838789778534
1995	54.00329615791167
1996	54.081087533764446
1997	54.3782007379501
1998	54.164337000250846
1999	54.87923102629131
2000	55.509639316699236
2001	55.72925521503298
2002	56.14948004720196
2003	56.419036453388344
2004	56.665498658649
2005	57.05810557151295
2006	57.54270914152649
2007	58.00940644920565
2008	58.01868742884508
2009	59.06225345394925
2010	59.3081381864351
2011	59.96632784371176
2012	60.16658424279599
2013	60.46601388694744
2014	60.70998735538693
2015	61.01446364341172
2016	61.292380360629714
2017	61.657084412036525
2018	61.9720515279674
2019	62.269780743055236
2020	61.762486987637644
2021	61.253265735449126
2022	61.79258830055621