Year	Percent change
1980	14.044
1981	9.546
1982	7.737
1983	3.657
1984	-0.797
1985	10.574
1986	4.242
1987	-1.243
1988	11.281
1989	1.575
1990	6.848
1991	-20.848
1992	31.952
1993	1.009
1994	29.837
1995	14.162
1996	11.217
1997	13.024
1998	0.296
1999	6.739
2000	-2.196
2001	1.528
2002	9.916
2003	10.953
2004	28.658
2005	13.655
2006	6.211
2007	25.413
2008	17.287
2009	1.337
2010	9.922
2011	16.978
2012	1.985
2013	-3.102
2014	6.614
2015	-1.096
2016	1.501
2017	11.507
2018	10
2019	10.5
2020	9
2021	9
2022	8.5
2023	8.5
2024	8.5