Year	Rate(percent)
1973	7.6
1974	10.79
1975	6.39
1976	5.11
1977	4.92
1978	7.25
1979	10.92
1980	12.68
1981	16.82
1982	12.23
1983	8.58
1984	10.04
1985	7.71
1986	6.26
1987	6.12
1988	7.11
1989	8.87
1990	7.82
1991	5.71
1992	3.36
1993	2.7
1994	3.75
1995	5.48
1996	4.95
1997	5.1
1998	5.04
1999	4.64
2000	5.89
2001	3.67
2002	1.29
2003	0.64
2004	0.82
2005	2.66
2006	4.51
2007	4.7
2008	2.05