Year	Percent
1974	1.121
1975	2.622
1988	3.612
1989	6.248
1990	10.09
1991	3.407
1992	0.7526
1993	0.9363
1994	2.132
1995	5.193
1996	6.814
1997	2.852
1998	3.976
1999	12.29
2000	9.188
2001	8.113
2002	6.165
2003	6.606
2004	9.777
2005	8.101
2006	7.981
2007	5.446