Year	Percent
1974	0.2532
1976	2.621
1982	0.1808
1983	0.1633
1984	0.2931
1985	2.112
1986	1.296
1987	1.173
1988	3.695
1989	0.4001
1990	3.187
1991	3.524
1992	0.662
1993	3.99
1994	2.473
1995	1.184
1996	2.829
1997	5.769
1998	0.7747
1999	0.6494
2000	2.921
2001	2.414
2002	3.261
2003	4.044
2004	2.891
2005	3.31
2006	2.939
2007	3.141