Year	Percent change
1980	10.162
1981	19.719
1982	2.218
1983	-4.052
1984	-8.873
1985	10.122
1986	16.9
1987	-2.423
1988	-20.42
1989	-16.165
1990	10.106
1991	3.441
1992	-19.402
1993	0.807
1994	3.045
1995	-5.668
1996	13.233
1997	19.547
1998	13.533
1999	0.842
2000	14.865
2001	12.703
2002	-6.401
2003	0.031
2004	8.954
2005	8.367
2006	5.966
2007	23.221
2008	6.211
2009	-9.101
2010	1.762
2011	11.616
2012	1.887
2013	4.066
2014	12.734
2015	1.82
2016	-5.681
2017	-3.517
2018	9.258
2019	0.316
2020	1.633
2021	3.008
2022	2.866
2023	2.866
2024	2.867