Year	years
1960	45.93245360612966
1961	46.66480759417704
1962	46.99663276922009
1963	47.92410657724617
1964	48.55996064895848
1965	49.16958412642579
1966	49.753567807951704
1967	50.28723776713337
1968	50.68252557703438
1969	51.33990839041214
1970	51.93123095900361
1971	52.582163332112
1972	53.14512343011851
1973	53.96253454702556
1974	54.757954186532366
1975	55.521620334992804
1976	55.91370263661964
1977	57.173957821312996
1978	57.74075333732435
1979	59.08360167259816
1980	59.92114474010615
1981	60.57391277993667
1982	61.2574057703384
1983	62.76399560969953
1984	63.64532948090524
1985	64.45405746725886
1986	65.17337982245748
1987	65.64419843526049
1988	66.08482659429181
1989	66.41956840726077
1990	66.43085932706468
1991	67.57045945646273
1992	68.07256165703969
1993	68.35852724880306
1994	68.68448141664078
1995	69.00677110327021
1996	69.43736593054462
1997	69.73008058780273
1998	69.89458770100113
1999	70.37087305737235
2000	70.82122788002889
2001	71.15051117029381
2002	71.49414774741248
2003	71.39737352016365
2004	71.96015430765969
2005	72.30334941758969
2006	72.6693697972654
2007	73.0035111210499
2008	73.05526479668825
2009	73.32137206035718
2010	73.64090031027929
2011	73.93242968152195
2012	73.89564618381212
2013	73.96797683682394
2014	74.23155428192244
2015	74.4390402856514
2016	74.89553930934017
2017	75.47086862646495
2018	75.57323067654347
2019	75.62756314013016
2020	74.7095540396599
2021	74.40676666208009
2022	74.80260179210383