Year	Percent
1984	0.6828
1985	0.8911
1986	0.1374
1987	0.9434
1988	0.2468
1989	0.3685
1990	0.2879
1991	0.3805
1992	1.467
1993	0.4902
1994	1.901
1995	2.521
1996	1.263
1997	2.419
1998	1.918
1999	1.116
2000	2.304
2001	1.837
2002	1.892
2003	2.381
2004	2.562
2005	1.633
2006	3.993
2007	2.166