Year	Percent
1991	0.04598
1992	3.571
1993	9.743
1994	0.284
1995	6.228
1996	3.905
1997	2.838
1998	3.827
1999	3.121
2000	3.143
2001	5.023
2002	5.993
2003	6.589
2004	7.24
2005	5.123
2006	4.893
2007	4.654