Year	Percent change
1980	6.969
1981	17.366
1982	-3.532
1983	-5.378
1984	19.487
1985	7.801
1986	3.021
1987	-5.046
1988	10.977
1989	6.313
1990	4.467
1991	-3.099
1992	4.317
1993	-2.451
1994	2.737
1995	5.613
1996	2.673
1997	16.532
1998	0.889
1999	1.495
2000	10.978
2001	1.565
2002	-0.892
2003	0.287
2004	10.2
2005	5.392
2006	7.07
2007	10.587
2008	5.292
2009	-12.258
2010	17.544
2011	7.81
2012	-0.927
2013	18.908
2014	-9.417
2015	2.521
2016	6.377
2017	-0.504
2018	4.597
2019	-1.235
2020	-0.018
2021	4.412
2022	4.729
2023	4.682
2024	4.678