Year	Percent
1991	2.046
1992	8.068
1993	12.38
1994	9.351
1995	13.12
1996	27.3
1997	15.56
1998	12.96
1999	10.58
2000	8.526
2001	11.03
2002	9.665
2003	9.385
2004	9.432
2005	10.3
2006	7.455
2007	7.398