Year	years
1960	61.354854722431575
1961	61.54790424785897
1962	61.38645373691028
1963	61.93764720426801
1964	62.43166111462217
1965	62.32178709407434
1966	62.408654898757185
1967	62.12811584941189
1968	62.14572526680483
1969	61.732837142948235
1970	62.221443490761985
1971	62.423195143550785
1972	62.63679286559563
1973	62.790328118039014
1974	62.869865836594116
1975	62.614648117692745
1976	62.607548767494926
1977	62.4536645649369
1978	62.49799060507821
1979	62.408255072346265
1980	62.5326985246197
1981	62.86164779962884
1982	63.225821875726155
1983	63.282553917558076
1984	63.164092553948514
1985	63.68364159056519
1986	64.78253090729774
1987	64.9407560340108
1988	64.91926566845207
1989	64.8785750262494
1990	64.66566743622074
1991	64.38019533699969
1992	63.40567861613665
1993	62.24132692159325
1994	61.973848343624184
1995	62.1130641731813
1996	62.83379677463317
1997	63.479411262276635
1998	63.96356705651208
1999	63.582034052099786
2000	63.68943226312517
2001	63.886243654525074
2002	63.99443458691338
2003	64.1099957068908
2004	64.42680702019122
2005	64.50433316079017
2006	65.20325212957603
2007	65.7287431661158
2008	66.08961465774584
2009	66.73687149098534
2010	67.13554668195196
2011	67.64612764497787
2012	68.0860342686139
2013	68.55422064204791
2014	68.77552216380384
2015	69.06008244779183
2016	69.40324728784175
2017	69.93026760507658
2018	70.10193608426171
2019	70.43506113815172
2020	68.76674438084609
2021	68.33731475153094
2022	70.05220177452053