Year	years
1960	54.49493597352574
1961	55.045468350907
1962	55.526591022642414
1963	55.98964128764889
1964	56.47103477736355
1965	56.855169188064984
1966	57.284105014503695
1967	57.64894634125029
1968	58.010035168763515
1969	58.37664485582043
1970	58.385043416829255
1971	59.25115141703945
1972	59.65483104715166
1973	60.171716775842185
1974	60.567878333169325
1975	61.07922669711878
1976	61.33218760403279
1977	61.87996191583132
1978	62.244537770092045
1979	62.609728289837605
1980	63.048613536442836
1981	63.517610189387774
1982	63.855434880423445
1983	64.44907794941103
1984	64.87721661981035
1985	65.20012421242461
1986	65.80654439691601
1987	66.24603612251381
1988	66.69041218857409
1989	67.06580876557756
1990	67.36205411505347
1991	67.7031899378219
1992	68.04919925596319
1993	68.39789887029896
1994	68.80446955750922
1995	69.12886617037515
1996	69.53221549451345
1997	69.87431879338293
1998	70.14829410611372
1999	70.60410505593936
2000	70.90651244504191
2001	71.25453319839916
2002	71.53699108763297
2003	71.7801804724459
2004	72.09169287713914
2005	72.47285461645052
2006	72.69617681316392
2007	72.84627968495882
2008	73.10394042431744
2009	73.30868123321535
2010	73.1797089352899
2011	73.69430632160879
2012	73.93763445569327
2013	74.19106394373459
2014	74.42849192405647
2015	74.47226527088472
2016	74.47175180163374
2017	74.64282278469372
2018	74.77198107743706
2019	74.96199687430595
2020	72.83630331903487
2021	71.90735614408102
2022	73.61244587983357