Year	years
1980	69.59756097560977
1981	70.18780487804878
1982	69.32439024390244
1983	70.3829268292683
1984	69.55365853658536
1985	69.69756097560976
1986	68.65609756097562
1987	68.23658536585366
1988	68.70243902439024
1989	67.97073170731709
1990	68.10731707317073
1991	70.71219512195123
1992	71.21463414634147
1993	69.46829268292684
1994	70.72926829268293
1995	72.4829268292683
1996	71.5609756097561
1997	71.21219512195123
1998	71.74634146341464
1999	72.66829268292685
2000	72.77804878048782
2001	73.25365853658538
2002	71.08780487804879
2003	71.02926829268294
2004	72.6609756097561
2005	72.13170731707318
2006	72.21707317073172
2007	73.14390243902439
2008	73.16341463414635
2009	73.0829268292683
2010	73.19756097560976
2011	72.72439024390245
2012	74.27560975609757
2013	73.11951219512196
2014	73.22926829268293
2015	74.29512195121953
2016	74.30975609756099
2017	74.30000000000001
2018	72.84146341463415
2019	74.04634146341465
2020	77.23658536585367
2021	73.39756097560975
2022	73.84878048780487