Year	Percent
1985	3.953
1987	8.52
1988	1.295
1989	3.684
1990	7.857
1991	4.459
1992	6.625
1994	9.108
1995	9.474
1996	9.471
1998	5.661
1999	5.879
2000	9.382
2001	5.855
2002	6.475
2003	7.505
2004	6.46
2005	5.49
2006	3.992
2007	4.282