Year	Percent change
1980	-9.22
1981	7.075
1982	-0.863
1983	-10.235
1984	-4.887
1985	8.108
1986	-13.147
1987	649.151
1988	-15.904
1989	32.428
1990	-5.41
1991	-3.134
1992	-12.951
1993	13.867
1994	3.082
1995	6.331
1996	6.044
1997	27.118
1998	-13.394
1999	-2.279
2000	12.778
2001	-6.833
2002	5.284
2003	-28.031
2004	4.497
2005	-5.146
2006	3.994
2007	5.285
2008	-12.586
2009	-14.213
2010	10.301
2011	5.119
2012	8.738
2013	-23.488
2014	19.199
2015	-0.571
2016	12.27
2017	1.189
2018	8.094
2019	5.978
2020	5.224
2021	5.579
2022	4.679
2023	3.182
2024	2.956