Year	Percent change
1981	12.508
1982	23.522
1983	9.575
1984	22.776
1985	-13.473
1986	29.567
1987	1.62
1988	6.23
1989	-4.008
1990	-12.999
1991	-1.275
1992	67.418
1993	20.079
1994	-18.766
1995	-10.635
1996	16.204
1997	33.404
1998	-2.823
1999	3.342
2000	3.84
2001	10.509
2002	5.136
2003	12.312
2004	12.947
2005	6.853
2006	5.325
2007	14.265
2008	30.164
2009	-9.59
2010	80.871
2011	27.535
2012	8.031
2013	10.171
2014	44.771
2015	-19.964
2016	3.526
2017	3.691
2018	-2.031
2019	0.393
2020	-1.729
2021	4.747
2022	4.533
2023	11.133
2024	9.42