Year	Percent
1989	9.94
1990	7.41
1991	7.12
1992	5.56
1993	5.26
1994	2.84
1995	4.09
1996	5.53
1997	2.03
1999	4.59
2000	5.58
2001	6.17
2002	6.94
2004	4.88
2005	6.54
2006	5.74
2007	5.95