Year	Percent
1973	1.037
1975	0.09533
1977	0.7389
1978	0.6589
1979	0.1908
1981	4.674
1982	0.5346
1983	18.82
1984	0.5295
1985	1.124
1986	5.935
1987	0.268
1988	1.57
1989	16.91
1990	16.71
1991	4.043
1992	4.632
1993	5.182
1994	1.633
1995	12.72
1996	17.07
1997	7.258
1998	22.57
1999	13.06
2000	13.33
2001	4.998
2002	6.397
2003	10.31
2004	9.955
2005	6.848
2006	7.671
2007	6.713