Year	Percent change
1980	16.983
1981	13.32
1982	1.432
1983	4.972
1984	15.32
1985	5.254
1986	-5.12
1987	-0.103
1988	6.696
1989	9.474
1990	7.183
1991	5.237
1992	4.38
1993	0.363
1994	2.167
1995	4.186
1996	4.809
1997	11.052
1998	-2.449
1999	1.947
2000	12.741
2001	-6.708
2002	7.765
2003	9.516
2004	14.274
2005	7.169
2006	10.315
2007	8.672
2008	1.558
2009	-23.427
2010	24.911
2011	-0.246
2012	-0.088
2013	0.761
2014	9.29
2015	2.941
2016	1.713
2017	6.799
2018	3.1
2019	2.138
2020	2.51
2021	3.046
2022	2.763
2023	2.683
2024	2.641