Year	years
1973	74.49756097560977
1978	75.98536585365855
1986	75.2658536585366
1987	75.46585365853659
1988	75.71463414634147
1989	75.91463414634147
1990	76.11463414634149
1991	76.36341463414635
1992	76.61463414634147
1993	76.91463414634147
1994	77.16585365853659
1995	77.36585365853661
1996	77.56829268292682
1997	77.8219512195122
1998	78.02682926829269
1999	78.23170731707317
2000	78.43658536585367
2001	78.64146341463415
2002	78.84390243902439
2003	78.9439024390244
2004	79.09268292682927
2005	79.29024390243904
2006	79.6390243902439
2007	79.98780487804879
2008	80.13658536585366
2009	80.33658536585367
2010	80.63658536585366
2011	80.88780487804878
2012	81.19024390243904
2013	81.44146341463414
2014	81.59268292682927
2015	81.79268292682929
2016	82.0439024390244
2017	82.2439024390244
2018	82.49512195121953
2019	82.64634146341464
2020	82.89756097560976
2021	83.09756097560977
2022	83.3