Year	Percent change
1980	30
1981	18.769
1982	4.023
1983	20.1
1984	19.4
1985	12.3
1986	11.8
1987	14.5
1988	-5.296
1989	5.257
1990	34.533
1991	-4.405
1992	7.463
1993	37.533
1994	-22.145
1995	28.927
1996	20.642
1997	18.173
1998	-2.257
1999	-1.426
2000	32.85
2001	-24.805
2002	20.715
2003	19.276
2004	20.576
2005	12.207
2006	8.443
2007	12.713
2008	-1.36
2009	-12.93
2010	17.717
2011	12.891
2012	0.935
2013	8.148
2014	-0.844
2015	1.277
2016	5.44
2017	9.397
2018	-9.397
2019	-7.723
2020	8.424
2021	8.261
2022	7.416
2023	6.805
2024	6.219