Year	Percent change
1980	-6.343
1981	6.202
1982	-4.486
1983	-33.245
1984	11.225
1985	5.889
1986	-9.235
1987	20.703
1988	-27.399
1989	5.141
1990	-1.442
1991	28.659
1992	-7.932
1993	20.722
1994	29.253
1995	16.223
1996	5.454
1997	-13.509
1998	-8.869
1999	-13.172
2000	19.133
2001	21.488
2002	-2.691
2003	-3.714
2004	10.8
2005	14.18
2006	7.997
2007	5.929
2008	13.21
2009	-8.544
2010	14.421
2011	3.066
2012	0.401
2013	7.713
2014	4.923
2015	-7.498
2016	-10.463
2017	16.041
2018	8.368
2019	-2.509
2020	-0.542
2021	0.472
2022	2.301
2023	2.121
2024	1.851