Year	Percent change
1980	-1.9
1981	-2.8
1982	4.2
1983	3.5
1984	-4.2
1985	12.1
1986	-7.6
1987	17.6
1988	14.1
1989	18.8
1990	8.877
1991	-5.75
1992	-0.446
1993	13.003
1994	3.821
1995	-1.029
1996	-0.986
1997	-0.624
1998	-1.237
1999	4.27
2000	4.423
2001	17.567
2002	15.286
2003	-22.391
2004	16.425
2005	6.963
2006	0.694
2007	7.116
2008	5.126
2009	-4.604
2010	11.328