Year	Percent change
1980	14.009
1981	-3
1982	16.779
1983	-1.197
1984	-6.461
1985	-0.734
1986	8.403
1987	-26.274
1988	-12.461
1989	5.4
1990	-1.3
1991	18.4
1992	1.9
1993	-6
1994	-2.8
1995	18.9
1996	-0.1
1997	37.2
1998	15.099
1999	-9.732
2000	5.836
2001	13.864
2002	2.437
2003	-1.716
2004	7.668
2005	5.037
2006	-1.857
2007	9.099
2008	9.575
2009	-15.68
2010	-17.507
2011	43.026
2012	10.125
2013	0.897
2014	-7.347
2015	16.205
2016	2.154
2017	-9.245
2018	-8.28
2019	-6.907
2020	1.257
2021	1.63
2022	1.203
2023	0.804
2024	0.57