Year	Percent
1991	2.687
1992	1.048
1993	2.316
1994	0.6858
1995	16.58
1996	5.674
1997	5.643
1998	22.87
1999	12.84
2000	11.74
2001	12.59
2002	8.659
2003	11.19
2004	11.67
2005	14.26
2006	12.47
2007	17.26