Year	Percent change
1980	-86.683
1981	-17.2
1982	76.5
1983	-31.8
1984	55.7
1985	-1.3
1986	8.1
1987	63.3
1988	-20.8
1989	-8.5
1990	4.2
1991	18.1
1992	-22.3
1993	32.7
1994	452.1
1995	23.2
1996	13.5
1998	0
1999	-25.968
2000	25.213
2001	3.042
2002	12.189
2003	14.427
2004	-21.001
2005	28.449
2006	6.732
2007	189.948
2008	-61.862
2009	10.801
2010	29.454
2011	36.186
2012	-9.816
2013	16.924
2014	53.327
2015	-17.335
2016	9.336
2017	-0.906
2018	2.778
2019	15.3
2020	8.543
2021	14.237
2022	10.715
2023	13.457
2024	11.601