Year	years
1960	45.85353124227925
1961	46.228114474051594
1962	46.65241257987056
1963	46.93913792355676
1964	47.36352301158992
1965	46.83911286910283
1966	47.331982007987804
1967	47.62825494012021
1968	48.657105310836734
1969	49.09749693618914
1970	49.044095185871925
1971	48.13455060267811
1972	50.08557370238925
1973	50.658267153471186
1974	51.086778836225754
1975	51.73290071772709
1976	52.26098986220158
1977	52.91134023265837
1978	53.43383071292158
1979	53.9412101604931
1980	54.47853916090759
1981	54.97370178790862
1982	55.39957181780072
1983	55.87940218671367
1984	56.314548198645
1985	56.70954981157481
1986	57.102880622962104
1987	57.474568443837626
1988	57.83927813354706
1989	58.20718666696068
1990	58.58834425996162
1991	58.770002701031444
1992	59.19776947417034
1993	59.449121167671734
1994	59.740527464614274
1995	60.040352110720576
1996	60.32947158615023
1997	60.72921956014153
1998	61.16108682800289
1999	61.676900668204816
2000	61.986693399631584
2001	62.333082041944586
2002	62.756300657551535
2003	63.14981758550745
2004	63.470697201824876
2005	63.84852468026285
2006	64.25545671894943
2007	64.5325590363024
2008	64.71817362009341
2009	65.16021582555715
2010	65.52809613924398
2011	65.97131511835687
2012	66.38216172697845
2013	66.79100930591447
2014	67.2288182812778
2015	67.62558980111237
2016	68.00928780799063
2017	68.3334812907
2018	68.57630437240715
2019	68.77964051700751
2020	68.24464181566492
2021	66.53281261853186
2022	67.1969794891736