Year	%
1991	17.48
1992	17.78
1996	11.12
1999	18.11
2001	8.78
2002	8.96
2003	8.9
2004	9.35
2005	9.3
2006	9.04
2007	7.69
2008	7.64
2010	10.75
2011	10.75
2012	10.55
2013	10.55
2021	8.08