Year	Percent
1991	3.03693
1992	2.15694
1993	3.57627
1994	9.87547
1995	-5.41612
1996	-6.22551
1997	9.75421
1998	15.14129
1999	-1.9746
2000	-1.75905
2001	0.6511
2002	6.5089
2003	-4.63997
2004	-2.61843
2005	-5.05601
2006	1.03059
2007	5.24999
2008	6.97027
2009	-5.35731
2010	-3.56072
2011	6.53458
2012	-4.70526
2013	3.66804
2014	0.52101
2015	8.22024
2016	2.1436
2017	2.36525