Year	Percent
1987	-1.12957
1988	0.31897
1989	1.24844
1990	1.32862
1991	4.74381
1992	1.32713
1993	5.51762
1994	-2.52558
1995	5.59159
1996	-3.81623
1997	-6.20253
1998	3.20684
1999	1.78057
2000	4.93696
2001	2.00069
2002	0.77104
2003	2.10622
2004	-2.91353
2005	2.4229
2006	0.35311
2007	-1.39701
2008	-1.65618
2009	1.68133
2010	2.38066
2011	3.49489
2012	-2.02262
2013	-4.04302
2014	-2.45049
2015	4.51151
2016	-0.54374
2017	1.41338