Year	Percent
1981	-8.91857
1982	-10.38977
1983	3.55795
1984	2.22582
1985	-7.52925
1986	-2.09701
1987	6.58989
1988	3.2672
1989	-2.95051
1990	1.31263
1991	8.21144
1992	3.97281
1993	10.10705
1994	-2.67756
1995	1.32833
1996	1.41689
1997	0.27502
1998	1.58467
1999	0.5571
2000	0.8528
2001	-2.34811
2002	-1.68518
2003	0.09271
2004	0.38855
2005	-0.35405
2006	-1.22385
2007	0.19297
2008	-1.25663
2009	-3.55527
2010	-0.36015
2011	-1.00061
2012	1.98122
2013	4.19886
2014	2.71119
2015	0.20332
2016	-0.6454
2017	-0.80716