Year	Percent
1989	10.23
1990	6.18
1991	6.22
1992	5.48
1993	6.54
1994	3.26
1995	3.38
1996	4.98
1997	2.11
1999	3.38
2000	3.58
2001	4.46
2002	4.31
2004	3.56
2005	4.54
2006	4.54
2007	4.53