Year	Percent
1991	11.14
1992	26.74
1993	12.84
1994	29.47
1995	22.79
1996	13.04
1997	19.89
1998	6.941
1999	9.933
2000	8.731
2001	10.01
2002	9.827
2003	9.188
2004	11.23
2005	9.261
2006	8.765
2007	6.836