Year	years
1960	44.270444767753446
1961	47.031306177140166
1962	50.60570000882726
1963	51.08093182602807
1964	51.59878484740039
1965	51.16811058081194
1966	51.93733650609196
1967	52.42967933269241
1968	53.130321939294994
1969	53.54343109477885
1970	54.08081766052286
1971	54.731513872571206
1972	55.180434084639806
1973	55.83490521653899
1974	56.34109341195644
1975	56.91492426123719
1976	57.444636262556784
1977	57.93027613718612
1978	58.35773707902105
1979	58.813643379374405
1980	59.178146674268994
1981	59.56233109410564
1982	59.995353979683586
1983	60.421410120196796
1984	60.8448455727753
1985	61.27544951075822
1986	61.758725050647804
1987	62.104040367654086
1988	62.370601637071495
1989	62.713385867001875
1990	62.90316239094936
1991	63.26041934264819
1992	63.54320553518978
1993	63.729164261323916
1994	64.01944591473577
1995	64.35443148464498
1996	64.72224436114745
1997	65.11527255430897
1998	65.44797175942124
1999	65.6922358052948
2000	65.97375542732398
2001	66.28163217976005
2002	66.62132797090204
2003	66.86867589633395
2004	67.10520614177362
2005	67.4954860460598
2006	67.82774920007715
2007	68.09761892470972
2008	68.32250158618447
2009	68.68195425842993
2010	68.96516099454462
2011	69.30591251248592
2012	69.6495556842752
2013	70.0193766368167
2014	70.40763018925671
2015	70.73365439809416
2016	70.97763612155754
2017	71.16594079846824
2018	71.48426725244273
2019	71.68059235384804
2020	70.82680118581823
2021	69.63185662027102
2022	70.4650746326166