Year	Percent
1974	0.5681
1975	5.475
1978	1.138
1979	1.308
1980	2.728
1982	1.001
1983	0.4205
1986	0.07959
1987	0.371
1988	10.1
1989	12.19
1990	9.812
1992	1.557
1993	5.489
1994	13.49
1995	24.86
1996	5.288
1997	27.04
1998	16.29
1999	12.29
2000	3.065
2001	20.02
2002	8.586
2003	9.901
2004	7.674
2005	12.96
2006	9.474
2007	10.1