Year	Percent
1990	10.9
1991	11.1
1992	11.3
1993	11.5
1994	11.8
1995	12
1996	12.1
1997	12.1
1998	12.1
1999	12.1
2000	12.1
2004	18
2005	19.04
2008	25.05
2009	24.57