Year	Percent change
1980	19.635
1981	4.101
1982	-13.918
1983	-10.227
1984	-9.216
1985	1.251
1986	34.971
1987	17.562
1988	2.946
1989	15.527
1990	0.401
1991	35.806
1992	-30.347
1993	66.257
1994	31.108
1995	-9.01
1996	20.009
1997	12.106
1998	1.834
1999	5.308
2000	9.381
2001	-11.844
2002	35.198
2003	-1.488
2004	2.348
2005	5.071
2006	3.546
2007	4.661
2008	3.544
2009	21.758
2010	20.415
2011	1.212
2012	-15.748
2013	-2.832
2014	40.162
2015	44.612
2016	-13.256
2017	-30.064
2018	-7.344
2019	6.851
2020	-0.743
2021	4.429
2022	2.736
2023	1.887
2024	0.886