Year	Percent change
1980	12.678
1981	2.613
1982	2.41
1983	2.393
1984	2.375
1985	2.359
1986	2.343
1987	2.327
1988	21.908
1989	21.269
1990	1.003
1991	2.395
1992	2.612
1993	-0.98
1994	-5.493
1995	3.985
1996	4.29
1997	-0.625
1998	3.738
1999	-2.582
2000	7.576
2001	3.803
2002	4.582
2003	0.813
2004	3.477
2005	7.756
2006	6.236
2007	-1.582
2008	5.572
2009	7.845
2010	8.714
2011	3.393
2012	3.829
2013	3.272
2014	6.843
2015	2.619
2016	-2.829
2017	-3.105
2018	0.805
2019	5.448
2020	1.549
2021	1.883
2022	-0.033
2023	1.215
2024	2.228