Year	Percent change
1981	-14.939
1982	-15.925
1983	-9.607
1984	-1.081
1985	-2.069
1986	22.172
1987	18.392
1988	7.627
1989	-1.808
1990	10.898
1991	-3.746
1992	6.1
1993	-15.104
1994	15.094
1995	22.652
1996	11.139
1997	-0.423
1998	4.787
1999	7.713
2000	12.817
2001	1.607
2002	-0.137
2003	2.783
2004	12.003
2005	7.142
2006	9.462
2007	5.874
2008	1.601
2009	-15.418
2010	11.144
2011	8.497
2012	0.285
2013	0.088
2014	4.624
2015	5.728
2016	2.611
2017	2.907
2018	2.467
2019	1.536
2020	2.434
2021	2.766
2022	2.766
2023	2.766
2024	2.766