Year	Percent
1991	6.032
1992	1.169
1993	1.348
1994	1.981
1995	7.157
1996	4.458
1997	7.927
1998	6.941
1999	18.88
2000	15.08
2001	8.566
2002	8.188
2003	8.901
2004	11.34
2005	12.29
2006	13.26
2007	19.19