Year	Percent change
1980	3.021
1981	5.557
1982	-20.674
1983	4.785
1984	9.884
1985	-27.987
1986	-8.255
1987	-34.075
1988	-2.96
1989	-7.285
1990	-4.935
1991	10.031
1992	4.291
1993	-4.67
1994	5.223
1995	14.054
1996	9.566
1997	4.402
1998	-10.025
1999	5.889
2000	-29.328
2001	-33.958
2002	-7.315
2003	18.375
2004	23.654
2005	9.21
2006	8.556
2007	4.219
2008	15.823
2009	-13.377
2010	27.814
2011	35.311
2012	22.943
2013	5.018
2014	3.371
2015	2.838
2016	-4.383
2017	8.756
2018	5.331
2019	3.111
2020	2.325
2021	-0.661
2022	0.008
2023	5.931
2024	14.342