Year	Percent
1988	3.072
1989	3.149
1990	5.81
1991	4.044
1992	18.07
1994	4.593
1995	4.231
1996	4.236
1998	9.931
1999	5.924
2001	2.235
2002	1.212
2003	5.537
2004	5.769
2005	5.857
2006	7.504
2007	4.652