Year	Percent change
1980	33.05
1981	20.51
1982	18.3
1983	16.46
1984	11.86
1985	9.091
1986	2.682
1987	11.161
1988	3.192
1989	12.25
1990	8.483
1991	-1.82
1992	9.034
1993	1.709
1994	12.087
1995	-2.926
1996	5.418
1997	6.9
1998	5.4
1999	0.373
2000	-0.165
2001	1.891
2002	7.43
2003	4.367
2004	7.847
2005	7.821
2006	3.231
2007	4.482
2008	6.267
2009	14.642
2010	-0.201
2011	2.875
2012	6.191
2013	-0.207
2014	-1.238
2015	1.923
2016	0.13
2017	1.298
2018	3.672
2019	5.141
2020	4.25
2021	3.5
2022	2.8
2023	2.8
2024	2.8