Year	%
1998	72.8884
2000	72.18741
2001	80.07786
2002	80.69114
2003	81.70317
2004	81.98389
2005	81.4024
2006	79.6045
2007	80.47318
2009	82.83418
2010	82.41039
2011	82.05772
2012	81.30876
2013	83.68179
2014	83.40837
2015	87.08213
2016	89.28533
2017	92.26153