Year	%
1995	16.9
1997	16.9
2001	18.03
2002	18.2
2003	18.87
2004	18.87
2005	19.15
2006	18.77
2007	17.37
2008	17.31
2009	17.31
2010	17.31
2011	16.48
2012	17.92
2013	15.76
2015	15.81
2016	15.81
2017	15.81