Year	Percent change
1980	-2.222
1981	-9.318
1982	-22.807
1983	12.987
1984	2.011
1985	0.563
1986	-2.801
1987	0
1988	29.789
1989	-4.36
1990	-7.245
1991	21.7
1992	2.205
1993	6.865
1994	2.096
1995	13.213
1996	-10.171
1997	21.846
1998	-1.807
1999	5.107
2000	14.564
2001	5.083
2002	1.117
2003	4.218
2004	0.953
2005	7.838
2006	10.872
2007	10.335
2008	-6.008
2009	-14.386
2010	8.378
2011	6.809
2012	2.246
2013	6.02
2014	0.259
2015	8.058
2016	1.817
2017	3.837
2018	7.134
2019	3.433
2020	3.185
2021	3.143
2022	3.066
2023	3.04
2024	3.054