Year	%
1997	2.72
2001	2.58
2002	2.58
2003	2.17
2004	2.17
2005	2.17
2006	2.17
2007	1.5
2008	1.5
2009	1.5
2010	1.5
2011	1.5
2013	1.3
2015	1.5
2016	1.5