Year	Percent change
1980	3.343
1981	17.14
1982	8.236
1983	-4.54
1984	6.829
1985	0
1986	0.989
1987	-15.462
1988	13.404
1989	25.935
1990	9.453
1991	6.848
1992	3.659
1993	1.959
1994	4.776
1995	4.193
1996	2.537
1997	6.314
1998	-0.822
1999	2.824
2000	-1.857
2001	3.771
2002	0.507
2003	2.856
2004	3.897
2005	4.171
2006	7.457
2007	5.094
2008	9.019
2009	2.674
2010	5.681
2011	2.913
2012	5.995
2013	3.11
2014	1.665
2015	-1.575
2016	0.843
2017	3.24
2018	3.649
2019	2.498
2020	2.498
2021	2.52
2022	2.52
2023	2.52
2024	2.52