Year	%
1994	20.5
1997	15.07
2001	16.37
2002	16.33
2003	16.27
2004	16.27
2005	16.35
2006	16.27
2007	15.58
2008	15.53
2009	15.53
2010	15.53
2011	15.53
2013	17.23
2014	17.13
2015	17.04