Year	Percent change
1980	20.25
1981	12.717
1982	3.852
1983	10.5
1984	10.714
1985	9.078
1986	-1.387
1987	-14.936
1988	8.948
1989	-0.158
1990	1.608
1991	1.508
1992	-5.907
1993	-0.568
1994	24.289
1995	11.643
1996	6.452
1997	-0.673
1998	4.07
1999	-1.164
2000	-0.761
2001	5.174
2002	5.026
2003	-1.309
2004	-3.109
2005	6.414
2006	1.519
2007	1.456
2008	9.121
2009	2.217
2010	1.289
2011	3.051
2012	5.32
2013	-2.383
2014	2.73
2015	1.442
2016	-1.8
2017	1.764
2018	1.734
2019	1.652
2020	2.24
2021	2.24
2022	2.24
2023	2.24
2024	2.24