Year	Percent change
1980	-39
1981	17.3
1982	1.7
1983	-2.7
1984	2.2
1985	-9.4
1986	-6.5
1987	-1.5
1988	26.9
1989	-22
1990	-15.8
1991	-3.886
1992	21.141
1993	-19.125
1994	-26.769
1995	27.968
1996	27.764
1997	8.432
1998	-5.44
1999	26.806
2000	3.965
2001	13.854
2002	-6.072
2003	13.358
2004	9.402
2005	37.501
2006	1.07
2007	48.219
2008	45.536
2009	6.096
2010	-21.438
2011	10.415
2012	8.439
2013	9.125
2014	11.238
2015	-21.86
2016	-25.328
2017	0.061
2018	10.201
2019	-9.463
2020	0.782
2021	0.907
2022	4.812
2023	1.169
2024	2.931