Year	Percent
1984	2.982
1988	0.03987
1989	0.01233
1990	0.157
1991	0.3797
1992	2.626
1993	1.681
1994	0.317
1995	0.1172
1996	0.1125
1997	1.235
1998	3.505
1999	5.058
2000	4.338
2001	2.602
2002	5.572
2003	5.053
2004	6.33
2005	7.527
2006	6.528
2007	6.244