Year	Percent change
1981	-24.748
1982	-3.102
1983	-5.428
1984	9.757
1985	-9.887
1986	12.719
1987	2.372
1988	-7.284
1989	11.444
1990	2.753
1991	1.824
1992	3.802
1993	6.658
1994	15.553
1995	6.461
1996	4.335
1997	-14.914
1998	14.695
1999	15.414
2000	9.274
2001	29.301
2002	5.077
2003	-31.63
2004	-1.17
2005	32.978
2006	2.463
2007	18.628
2008	12.921
2009	-17.795
2010	-10.157
2011	6.453
2012	6.312
2013	-1.176
2014	4.28
2015	2.561
2016	-7.41
2017	-1.279
2018	-6.278
2019	19.297
2020	5.917
2021	4.293
2022	4.43
2023	4.844
2024	4.538