Year	Percent
1970	7.2
1971	8.1
1972	4.5
1973	5.2
1974	5.3
1976	6.1
1977	4.6
1978	4.5
1979	3.8
1983	3.85
1984	4.1
1989	5.04
1991	5.15
1993	7.6
1994	6.8
1995	5.5
1999	6
2001	8.22
2002	8.3
2003	7.75
2006	5.28
2007	5.21
2008	8.33
2009	5.69
2010	6.23