Year	Percent change
1980	-6.28
1981	9.749
1982	4.126
1983	6.386
1984	-0.828
1985	-0.934
1986	9.224
1987	18.962
1988	-2.936
1989	-4.904
1990	8.856
1991	15.97
1992	8.783
1993	14.07
1994	13.196
1995	9.368
1996	7.185
1997	4.191
1998	2.124
1999	15.55
2000	11.96
2001	-5.441
2002	-1.246
2003	-0.786
2004	11.849
2005	3.488
2006	3.415
2007	11.093
2008	2.473
2009	-13.839
2010	15.247
2011	11.117
2012	2.103
2013	1.319
2014	2.269
2015	-0.005
2016	10.157
2017	5.078
2018	6.008
2019	4.9
2020	4.372
2021	3.5
2022	3.5
2023	3.5
2024	3.5