Year	Percent
1992	12.91
1994	4.906
1995	8.35
1996	8.297
1997	13.77
1998	14.58
1999	9.549
2000	17.22
2001	12.28
2002	14.09
2003	11.38
2004	15.69
2005	13.28
2006	10.71
2007	8.343