Year	Percent change
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1991	38.42
1992	-9.416
1993	-1.166
1994	10.678
1995	-8.875
1996	-2.221
1997	5.877
1998	-7.538
1999	-18.344
2000	-63.738
2001	-25.69
2002	38.73
2003	0.429
2004	-4.593
2005	1.238
2006	3.927
2007	15.851
2008	21.688
2009	6.427
2010	6.926
2011	-0.962
2012	-11.759
2013	0.042
2014	15.344
2015	-0.067
2016	-6.73
2017	-18.629
2018	8.92
2019	-1.715
2020	1.078
2021	0.323
2022	0.376
2023	0.347
2024	0.468