Year	Percent
1971	2.843
1972	6.789
1973	0.1017
1975	3.918
1976	4.07
1981	1.879
1982	2.096
1983	3.351
1984	2.377
1985	1.588
1986	1.944
1987	10.19
1988	7.144
1989	5.233
1990	10.64
1991	10.62
1992	10.62
1993	10.62
1994	1.688
1995	1.677
1996	2.871
1997	3.57
1998	5.313
1999	3.717
2000	1.688
2001	7.876
2002	1.088
2003	0.8921
2004	5.263
2005	6.055
2006	4.849
2007	2.321