Year	Percent
1973	1.087
1974	2.453
1975	1.829
1976	0.338
1977	0.3065
1978	1.174
1979	2.346
1980	0.2543
1982	0.3956
1983	0.3571
1984	0.6999
1985	1.194
1987	0.2489
1988	0.898
1990	24.45
1991	1.486
1992	2.009
1993	2.189
1994	2.798
1995	2.801
1998	13.75
1999	5.766
2000	4.695
2001	2.617
2002	7.493
2003	12.85
2004	2.696
2005	3.535
2006	2.619
2007	1.849