Year	Percent
1982	10.43
1983	0.1997
1984	5.572
1985	0.6629
1986	2.713
1987	8.333
1988	8.656
1989	6.171
1990	6.894
1991	14.37
1992	11.03
1993	8.57
1994	7.95
1995	9.553
1996	12.21
1997	17.63
1998	11.62
1999	7.264
2000	15.63
2001	4.692
2002	1.884
2003	2.136
2004	1.086
2005	9.496
2006	7.5
2007	9.275