Year	Percent change
1980	-21.798
1981	-2.425
1982	-4.189
1983	5.198
1984	11.168
1985	10.1
1986	-6.3
1987	5.4
1988	35.693
1989	-8.344
1990	-2.012
1991	29.268
1992	0.688
1993	7.351
1994	0.983
1995	12.987
1996	-11.637
1997	20.281
1998	-6.084
1999	4.005
2000	14.766
2001	5.968
2002	0.549
2003	5.566
2004	2.922
2005	9.181
2006	11.542
2007	11.675
2008	-6.383
2009	-12.565
2010	8.134
2011	7.124
2012	0.986
2013	5.645
2014	0.658
2015	8.259
2016	-0.372
2017	3.982
2018	7.693
2019	3.909
2020	3.515
2021	3.456
2022	3.373
2023	3.357
2024	3.376