Year	years
1960	41.6942809155079
1961	42.14361564070912
1962	42.67156852993367
1963	42.817829623419186
1964	43.47269232977721
1965	43.505792404260816
1966	43.908290743973275
1967	44.42628970028778
1968	44.79705596926499
1969	45.04350231023098
1970	44.03778239494279
1971	40.0817777256322
1972	45.547577327819035
1973	46.10178599299499
1974	46.16840489267247
1975	46.314370460828364
1976	46.93655519514606
1977	47.505560619704596
1978	47.77097709171169
1979	48.18444966316174
1980	48.69044519789367
1981	48.966412491574324
1982	49.10427687437624
1983	48.66797618451697
1984	48.63005696704102
1985	48.96339769364981
1986	49.57391758571878
1987	50.08527730758635
1988	49.98249100356814
1989	50.97871943924979
1990	51.29931477060325
1991	51.03914576800981
1992	51.518276569154345
1993	52.003871771649656
1994	52.66720063388054
1995	53.02275987840685
1996	53.215411153464544
1997	53.734293813833496
1998	53.836288433336975
1999	55.1128291734651
2000	55.675533349576796
2001	56.10244774223147
2002	56.45902004383902
2003	56.90306833347801
2004	57.262270916675504
2005	57.7839355368618
2006	58.31846030931109
2007	58.67255024308193
2008	58.82415399436294
2009	59.562405957508616
2010	60.04743424576381
2011	60.60610138729219
2012	60.83018937475067
2013	61.00836392356532
2014	61.427968483193425
2015	61.78254210759301
2016	62.251717627297445
2017	62.63612064157001
2018	63.03385328250767
2019	63.33425393914479
2020	62.832792543095465
2021	62.41706768556092
2022	63.008320058600546