Year	Percent change
1980	3.792
1981	-2.765
1982	9.619
1983	-0.557
1984	4.337
1985	6.324
1986	8.3
1987	-2.544
1988	10.415
1989	2.366
1990	4.035
1991	7.216
1992	-2.098
1993	-0.741
1994	10.588
1995	-5.405
1996	12.373
1997	-1.561
1998	7.239
1999	1.081
2000	1.913
2001	7.32
2002	3.121
2003	5.961
2004	4.797
2005	3.292
2006	7.575
2007	3.532
2008	5.923
2009	4.244
2010	3.816
2011	5.246
2012	3.01
2013	4.535
2014	2.669
2015	4.55
2016	1.126
2017	4.087
2018	3.057
2019	3.18
2020	3.827
2021	4.143
2022	4.266
2023	4.389
2024	4.5