Year	Percent change
1980	-2.84
1981	19.183
1982	17.525
1983	-8.555
1984	6.058
1985	-6.477
1986	0.805
1987	-2.679
1988	-4.556
1989	-18.134
1990	21.841
1991	-21.027
1992	-55.779
1993	61.684
1994	-25.918
1995	54.065
1996	43.14
1997	19.531
1998	31.916
1999	11.888
2000	-4.295
2001	-9.132
2002	0.169
2003	4.054
2004	2.314
2005	13.693
2006	12.844
2007	8.427
2008	11.175
2009	14.208
2010	-3.981
2011	24.024
2012	-1.584
2013	21.987
2014	6.477
2015	7.472
2016	-3.252
2017	-0.03
2018	-1.19
2019	2.449
2020	3.721
2021	3.33
2022	3.06
2023	3.209
2024	2.211