Year	Percent
1988	3.767
1990	0.02041
1991	0.05392
1992	9.032
1993	0.1747
1994	0.6098
1995	2.977
1996	4.815
1997	2.066
1998	3.12
1999	3.187
2000	3.055
2001	4.017
2002	5.738
2003	3.909
2004	3.553
2005	3.17
2006	3.581
2007	3.243