Year	%
1991	21.46
1992	22.04
1996	14.25
1999	26.87
2001	13.78
2002	12.4
2003	12.4
2004	14.29
2005	14.13
2006	13.94
2007	14.9
2008	14.69
2010	15.81
2011	15.8
2012	16.45
2013	16.35
2021	17.73