Year	Percent change
1980	-3.576
1981	2.472
1982	-2.468
1983	6.035
1984	12.974
1985	4.388
1986	5.501
1987	-0.295
1988	0.296
1989	-5.706
1990	0.419
1991	-4.3
1992	6.6
1993	-10.378
1994	-41.89
1995	24.541
1996	11.596
1997	14.9
1998	8.34
1999	3.308
2000	8.353
2001	8.506
2002	13.18
2003	2.208
2004	7.454
2005	9.381
2006	9.225
2007	7.621
2008	11.159
2009	6.26
2010	7.319
2011	7.836
2012	8.814
2013	4.678
2014	7.62
2015	8.873
2016	5.965
2017	6.153
2018	8.575
2019	7.8
2020	8.1
2021	8.2
2022	8
2023	7.5
2024	7.5