Year	%
1991	76.3
1994	84.5
1997	91
2000	88.3
2003	91.5
2005	88.6
2006	90.38
2007	93.3
2008	92.65
2009	94.51
2010	92.7
2012	95.7
2013	95.4
2017	97.5