Year	Percent change
1980	-3.212
1981	-1.086
1982	-21.257
1983	-16.601
1984	6.406
1985	-6.02
1986	-9.253
1987	23.846
1988	3.78
1989	5.591
1990	-8.069
1991	10.378
1992	37.625
1993	8.416
1994	5.806
1995	6.615
1996	-6.386
1997	27.334
1998	29.822
1999	1.046
2000	8.647
2001	11.206
2002	6.366
2003	-0.577
2004	7.878
2005	-0.572
2006	6.45
2007	7.235
2008	-5.747
2009	-7.801
2010	9.995
2011	7.002
2012	2.792
2013	4.259
2014	6.967
2015	9.314
2016	3.456
2017	2.282
2018	4.71
2019	4.46
2020	4.12
2021	4.1
2022	3.9
2023	4.1
2024	4.27