Year	years
1960	49.02677773025269
1961	50.93563613882284
1962	53.240751767601665
1963	53.55898812879742
1964	54.03144022493975
1965	53.76572545747377
1966	54.33854450039165
1967	54.72547200895774
1968	55.139908909787394
1969	55.45956068701162
1970	55.78272636520493
1971	55.77534217097847
1972	56.73395467411202
1973	57.23268843837247
1974	57.625250548978585
1975	58.06420183285316
1976	58.515486255653705
1977	58.94517686196186
1978	59.25989586347626
1979	59.64532460457039
1980	59.949812444174924
1981	60.28840576676182
1982	60.62900257483763
1983	60.86709001028361
1984	61.17062389122638
1985	61.48449341451502
1986	61.88720464969576
1987	62.180166810358784
1988	62.33127198102952
1989	62.68117349793089
1990	62.82868235025989
1991	63.03739541609377
1992	63.290293249460376
1993	63.445616241634
1994	63.71701394758763
1995	63.91566641251828
1996	64.22981843600654
1997	64.57843456865152
1998	64.8309875212021
1999	65.16710427805721
2000	65.47320697592231
2001	65.76415790093395
2002	66.05116012028364
2003	66.30639024921399
2004	66.56020808128386
2005	66.87194906368094
2006	67.22425094880035
2007	67.47107123343417
2008	67.65920505119391
2009	68.03494727850888
2010	68.30976796040162
2011	68.63864520269347
2012	68.90437232644399
2013	69.19214217415772
2014	69.52258412817221
2015	69.75894846624925
2016	69.99497833542792
2017	70.16921779712504
2018	70.43122658593354
2019	70.62269892262589
2020	69.79730171368841
2021	68.89665080126413
2022	69.60315235384793