Year	%
1988	82.8
1993	85.7
1994	85.7
1998	88.7
1999	87.5
2003	91.9
2006	92.1
2007	96.1
2008	90.1
2011	96.4
2014	90.5
2016	97.5
2017	97.6
2018	97.1
2019	97.4