Year	Percent
1986	-9.97362
1987	-8.79575
1988	-11.05989
1989	-10.20575
1990	-9.23847
1991	-5.11687
1992	-4.08569
1993	-8.7667
1994	-9.44694
1995	-9.09556
1996	-10.96877
1997	-8.13907
1998	-7.30464
1999	-2.85491
2000	-3.5741
2001	-1.83207
2002	-7.2186
2003	-10.98144
2004	-13.55442
2005	-3.31586
2006	-2.87999
2007	-13.56963
2008	-13.6441
2009	-9.48855
2010	-8.21266
2011	-4.1328
2012	3.50331
2013	2.15805
2014	3.27501
2015	0.79108
2016	2.5616
2017	2.80124