Year	Percent change
1980	-29.397
1981	-28.748
1982	-28.857
1983	19.745
1984	10.663
1985	-13.094
1986	9.998
1987	-16.221
1988	-6.001
1989	66.119
1990	-44.8
1991	-94.781
1992	1684.79
1993	96.191
1994	0.256
1995	-1.134
1996	0.406
1997	-0.114
1998	0.535
1999	-10.22
2000	6.228
2001	-0.894
2002	-13.412
2003	29.225
2004	6.416
2005	17.181
2006	-4.609
2007	-0.317
2008	4.191
2009	-7.519
2010	0
2011	17.29
2012	12.453
2013	-2.526
2014	-1.751
2015	0.085
2016	1.081
2017	-4.816
2018	0.95
2019	1.92
2020	2.432
2021	2.432
2022	1.866
2023	1.865
2024	1.863