Year	Percent change
1980	16.475
1981	-2.592
1982	-3.237
1983	-19.213
1984	-10.404
1985	-1.672
1986	2.492
1987	-3.209
1988	-3.342
1989	19.965
1990	9.298
1991	0.46
1992	-4
1993	27.209
1994	23.286
1995	32.924
1996	6.933
1997	21.235
1998	3.756
1999	-16.482
2000	14.122
2001	3.672
2002	-11.972
2003	-3.085
2004	14.033
2005	9.752
2006	15.044
2007	21.196
2008	14.442
2009	-10.969
2010	34.532
2011	8.474
2012	-0.341
2013	8.41
2014	-0.113
2015	-13.46
2016	-8.237
2017	5.088
2018	6.786
2019	12.734
2020	3.925
2021	4.664
2022	4.841
2023	4.914
2024	4.63