Year	%
1997	14.55
2001	14.46
2002	14.46
2003	14.13
2004	14.13
2005	14.13
2006	14.13
2007	13.6
2008	13.6
2009	13.6
2010	13.6
2011	13.6
2013	14.57
2015	13.6
2016	13.6