Year	Percent change
1980	8.635
1981	8.128
1982	6.429
1983	7.875
1984	20.3
1985	5.071
1986	-13.054
1987	-2.73
1988	14.9
1989	-4.9
1990	0.5
1991	4.2
1992	-3.8
1993	-10.874
1994	41.272
1995	5.364
1996	11.331
1997	5.572
1998	4.259
1999	-8.447
2000	3.823
2001	12.431
2002	5.192
2003	-1.753
2004	-4.803
2005	3.327
2006	8.069
2007	-7.44
2008	8.311
2009	10.122
2010	-2.109
2011	1.858
2012	7.698
2013	0.226
2014	1.675
2015	6.758
2016	-1.122
2017	-0.935
2018	2.483
2019	2.892
2020	2.987
2021	3.044
2022	3.031
2023	2.998
2024	2.443