Year	years
1960	54.670339489705526
1961	55.228400417778595
1962	55.681348114093
1963	56.12443553656095
1964	56.62342924565543
1965	57.025246704785985
1966	57.447125332566095
1967	57.83935829643747
1968	58.22249474393282
1969	58.576025355586296
1970	58.639004828373366
1971	59.47036266643806
1972	59.83713494038427
1973	60.38916075238189
1974	60.81204396076506
1975	61.35035881830341
1976	61.583610066685324
1977	62.161060179022
1978	62.53930333717471
1979	62.89675217872346
1980	63.333652673419756
1981	63.838570139300614
1982	64.18065603151341
1983	64.74787552405014
1984	65.17264070625016
1985	65.5046498651311
1986	66.1127831799348
1987	66.54691530315246
1988	66.96856965559009
1989	67.31851608174092
1990	67.6135615180279
1991	67.97989755976408
1992	68.31907947250107
1993	68.65454665781648
1994	69.04176546534467
1995	69.35717554301614
1996	69.73645092919674
1997	70.09998133294376
1998	70.35355339362644
1999	70.76264752692664
2000	71.0805248890518
2001	71.33979396947093
2002	71.69550136933697
2003	71.88270375814392
2004	72.21107470453687
2005	72.59045551050886
2006	72.80306350769742
2007	72.94634649738931
2008	73.17223254178313
2009	73.38053577416868
2010	73.26908174486069
2011	73.7657830325408
2012	73.99658653709734
2013	74.25075158909354
2014	74.46062715024442
2015	74.5221420460803
2016	74.48903004918225
2017	74.65637969843159
2018	74.77751484072873
2019	74.97284057636965
2020	72.92992868159392
2021	72.0773193689861
2022	73.64381041784624