Year	Percent
1974	1.247
1976	2.276
1977	7.947
1978	5.455
1979	9.477
1980	11.45
1982	16.52
1983	10.82
1984	0.7136
1985	20.43
1986	12.9
1987	10.9
1988	4.682
1989	12.53
1990	33.5
1991	1.078
1992	11.93
1993	20.19
1994	3.866
1995	4.448
1996	17.82
1997	11.78
1998	19.45
1999	25.68
2000	6.192
2001	4.629
2002	5.24
2003	8.44
2004	19.5
2005	7.396
2006	19.49
2007	3.346