Year	Percent
1986	2.086
1987	3.165
1988	2.053
1989	0.4553
1990	0.128
1991	1.525
1992	0.01561
1995	0.00315
1996	0.451
1997	0.6619
1998	0.2786
1999	0.3316
2000	2.113
2001	0.562
2002	2.632
2003	0.421
2004	0.7879
2005	1.44
2006	0.538
2007	2.258