Year	Percent change
1981	11.285
1982	15.913
1983	12.382
1984	9.701
1985	11.681
1986	4.106
1987	-5.164
1988	-2.079
1989	0.809
1990	-0.909
1991	-0.718
1992	-0.496
1993	0.498
1994	37.539
1995	5.51
1996	2.494
1997	1.969
1998	0.908
1999	0.486
2000	1.366
2001	4.051
2002	1.484
2003	-1.488
2004	1.709
2005	1.422
2006	3.909
2007	6.178
2008	5.548
2009	-4.541
2010	4.289
2011	2.735
2012	1.137
2013	-0.079
2014	-0.778
2015	0.394
2016	2.06
2017	-0.655
2018	1.328
2019	1.866
2020	1.5
2021	1.5
2022	1.5
2023	1.5
2024	1.5