Year	Percent
1981	-1.1365
1982	-2.48203
1983	-4.0679
1984	-2.93502
1985	-2.78781
1986	0.79195
1987	-0.80101
1988	-3.57855
1989	-2.42499
1990	-1.90253
1991	4.39848
1992	3.79172
1993	-4.49824
1994	-1.22916
1995	0.84605
1996	0.0995
1997	1.10919
1998	0.34944
1999	0.72803
2000	1.24634
2001	-0.61888
2002	3.26389
2003	2.96008
2004	11.00153
2005	1.37047
2006	5.8472
2007	5.37757
2008	1.36034
2009	-1.1432
2010	4.2763
2011	3.0778
2012	2.81964
2013	3.21722
2014	3.90832
2015	3.7196
2016	-1.49899
2017	-2.88828