Year	Percent change
1980	18.329
1981	-12.079
1982	10.245
1983	26.688
1984	23.571
1985	38.905
1986	-11.828
1987	-3.892
1988	9.102
1989	-2.678
1990	12.667
1991	0.944
1992	7.462
1993	-5.017
1994	-6.394
1995	18.848
1996	-12.798
1997	11.264
1998	4.054
1999	5.01
2000	-4.017
2001	26.989
2002	-9.45
2003	15.548
2004	38.031
2005	6.512
2006	13.688
2007	1.303
2008	19.636
2009	-12.811
2010	18.876
2011	12.35
2012	4.054
2013	25.929
2014	10.722
2015	46.528
2016	15.851
2017	1.895
2018	3.05
2019	4.778
2020	5.028
2021	4.656
2022	3.977
2023	-8.737
2024	4.218