Year	years
1960	67.93395196290447
1961	68.23593223494451
1962	67.69016198351135
1963	68.67400262823836
1964	69.17022698965607
1965	69.32345959074273
1966	69.8234553673133
1967	69.32427447551655
1968	69.5551095617349
1969	69.0547392575317
1970	69.33041520825253
1971	69.50148113719773
1972	69.9606341578404
1973	70.10027745226874
1974	70.35208632065186
1975	70.17597267073096
1976	70.32058986646437
1977	70.2459730644075
1978	70.14466576225746
1979	70.24776109264322
1980	69.88898462361203
1981	70.37205017777737
1982	70.45547331873172
1983	70.38978516942959
1984	70.3491148561342
1985	70.31288346632365
1986	70.56513603974433
1987	70.61176333123417
1988	70.86170822505203
1989	70.73197225974846
1990	70.6563313372586
1991	70.57522130347742
1992	70.73283713141566
1993	70.84598661514481
1994	70.8695439447473
1995	71.02542142828905
1996	71.33605801899508
1997	71.51725806968221
1998	71.89823767599563
1999	72.18456107408748
2000	72.71972472277903
2001	73.09614819373434
2002	73.24241548809213
2003	73.3822527825258
2004	73.73043493273813
2005	73.84499513592114
2006	74.09260273080976
2007	74.25064872107684
2008	74.57595267807793
2009	74.93036392665763
2010	75.29396577863139
2011	75.8884748834282
2012	75.99348860345306
2013	76.35516298698086
2014	76.67562361130449
2015	76.57187776477879
2016	76.96981141719114
2017	76.92837635562478
2018	76.97682268184022
2019	77.2668446661451
2020	76.08235436270056
2021	74.79740109622477
2022	76.79008321335546