Year	Percent
1985	8.7
1986	5.88
1987	7.92
1988	8
1990	4.76
1991	3.33
1993	3.45
1995	3.33
1996	2.94
1998	4.55
1999	3.7
2002	3.7
2005	3.57
2006	3.13
2007	3.23
2010	5.1007