Year	Percent
1987	0.3845
1988	0.874
1989	0.09089
1990	0.1452
1991	0.3688
1992	1.709
1993	2.431
1994	2.87
1995	3.014
1996	2.823
1997	3.062
1998	6.354
1999	5.855
2000	5.624
2001	5.143
2002	5.455
2003	5.85
2004	6.747
2005	10.21
2006	8.861
2007	8.433