Year	Percent
1992	10.6
1993	11.4
1994	11
1995	9.86
1996	10.36
1997	12.41
1998	13.67
2000	11.98
2002	14.05
2003	13.08
2004	15.12
2005	17.11
2006	11.33
2007	10.18
2008	8.05
2009	7.84
2011	8.39
2013	10.48