Year	%
1991	17.28
1992	17.27
1996	9.17
1999	17.9
2001	6.68
2002	6.57
2003	6.57
2004	6.56
2005	6.59
2006	6.55
2007	5.64
2008	5.63
2010	9.03
2011	9.03
2012	9.03
2013	9.03
2021	5.64