Year	%
1991	18.73
1992	19.21
1996	12.07
1999	19.88
2001	9.95
2002	9.74
2003	9.78
2004	10.54
2005	10.46
2006	9.98
2007	8.81
2008	8.76
2010	11.94
2011	11.94
2012	11.47
2013	11.43
2021	10.42