Year	Percent change
1980	-23.031
1981	-22.434
1982	-15.942
1983	-0.225
1984	-17.055
1985	25.362
1986	-26.517
1987	0.885
1988	25.828
1989	23.083
1990	3.272
1991	9.313
1992	14.463
1993	-15.272
1994	25.657
1995	-13.165
1996	35.251
1997	23.47
1998	-20.721
1999	15.347
2000	-21.308
2001	-4.852
2002	12.738
2003	6.177
2004	11.973
2005	4.364
2006	6.304
2007	-10.377
2008	37.561
2009	-18.711
2010	42.098
2011	-14.302
2012	-9.507
2013	1.042
2014	8.076
2015	0.592
2016	4.94
2017	0.409
2018	-1.366
2019	7.662
2020	5.604
2021	5.823
2022	6.182
2023	6.329
2024	6.199