Year	Percent change
1980	-4.809
1981	-4.311
1982	-4.667
1983	-7.62
1984	-0.791
1985	-7.568
1986	11.94
1987	-6.61
1988	-0.837
1989	39.899
1990	18.698
1991	-0.417
1992	-7.816
1993	15.901
1994	28.712
1995	10.779
1996	6.4
1997	2
1998	0
1999	0.314
2000	4.908
2001	2.521
2002	5.248
2003	6.454
2004	6.469
2005	6.903
2006	-9.949
2007	-15.911
2008	29.124
2009	6.47
2010	28.526
2011	-25.99
2012	25.81
2013	0
2014	10.855
2015	-14.682
2016	40.523
2017	-3.142
2018	0.906
2019	9.239
2020	6.021
2021	6.381
2022	6.702
2023	5.111
2024	6.748