Year	Percent
1997	0.85118
1998	0.36881
1999	0.92702
2000	-0.83843
2001	-2.67646
2002	-1.85659
2003	-1.22183
2004	-5.03181
2005	0.21996
2006	0.66212
2007	1.74903
2008	-0.69536
2009	1.5365
2010	-6.88464
2011	4.01098
2012	1.44363
2013	2.80954
2014	1.44203
2015	-0.0984
2016	0.17818
2017	-0.06033