Year	Percent change
1980	-1.2
1981	-8.1
1982	-15.4
1983	-1.3
1984	-1.2
1985	39.2
1986	-10.9
1987	18.2
1988	-3.2
1989	5.2
1990	8.223
1991	15.469
1992	15.799
1993	28.12
1994	23.384
1995	-19.162
1996	10.401
1997	-11.841
1998	0.774
1999	11.434
2000	0.24
2001	19.982
2002	5.84
2003	12.843
2004	5.449
2005	5.788
2006	-25.463
2007	14.924
2008	18.457
2009	14.145
2010	5.364