Year	%
1997	27.07
2001	27.07
2002	27.07
2003	27.08
2004	27.08
2005	27.08
2006	27.08
2007	27.23
2008	27.23
2009	27.23
2010	27.23
2011	27.23
2013	27.45
2014	27.45
2015	27.45