Year	%
1991	26.14
1992	27.95
1996	18.23
1999	28.03
2001	17.97
2002	15.05
2003	15.59
2004	19.73
2005	18.91
2006	17.19
2007	17.13
2008	17.09
2010	20.09
2011	20.1
2012	17.69
2013	17.4
2021	24.25