Year	Percent change
1981	15.353
1982	0.934
1983	-30.968
1984	24.584
1985	-8.531
1986	63.442
1987	83.915
1988	15.381
1989	-35.438
1990	11.646
1991	66.153
1992	-56.506
1993	33.039
1994	36.455
1995	-45.982
1996	149.574
1997	-33.231
1998	24.523
1999	18.37
2000	-35.799
2001	-38.479
2002	72.507
2003	-3.648
2004	-15.317
2005	107.519
2006	131.122
2007	40.95
2008	20.231
2009	-10.247
2010	29.52
2011	-19.383
2012	23.81
2013	-17.663
2014	-5.643
2015	-15.453
2016	-16.286
2017	1.083
2018	-20.482
2019	-18.052
2020	-7.256
2021	-9.851
2022	53.411
2023	-37.019
2024	1.798