Year	Percent change
1980	-11.3
1981	8.064
1982	-7.251
1983	-37.559
1984	-27.838
1985	-1.949
1986	-4.522
1987	7.641
1988	6.866
1989	5.323
1990	20.018
1991	31.362
1992	-1.712
1993	2.043
1994	5.433
1995	5.015
1996	20.941
1997	3.943
1998	13.45
1999	19.286
2000	14.012
2001	48.414
2002	21.083
2003	7.375
2004	12.999
2005	8.254
2006	9.243
2007	-7.09
2008	11.264
2009	-6.087
2010	-24.445
2011	22.889
2012	43.979
2013	6.093
2014	2.733
2015	2.226
2016	-4.688
2017	32.824
2018	-2.272
2019	8.279
2020	8.237
2021	5.127
2022	1.352
2023	21.051
2024	26.525