Year	Percent change
1980	-32.9
1981	-21
1982	-22.5
1983	-27.1
1984	-8.2
1985	17
1986	14.9
1987	123.1
1988	75.4
1989	11.5
1990	2
1991	-4.804
1992	0.164
1993	-18.526
1994	-8.541
1995	7.865
1996	-9.301
1997	-0.74
1998	33.736
1999	10.487
2000	-2.979
2001	-5.539
2002	5.831
2003	4.82
2004	9.242
2005	6.236
2006	8.639
2007	11.737
2008	10.009
2009	6.933
2010	5.971
2011	18.313
2012	11.297
2013	4.069
2014	8.137
2015	0.718
2016	-10.129
2017	-11.395
2018	-1.478
2019	7.116
2020	9.693
2021	7.992
2022	6.996
2023	6.852
2024	7.123