Year	Percent
1997	0.61374
1998	1.51402
1999	0.86331
2000	0.3994
2001	0.61948
2002	0.56893
2003	0.62104
2004	0.68455
2005	0.64296
2006	2.06675
2007	1.77867
2008	5.28472
2009	0.18904
2010	-0.24198
2011	-6.06602
2012	4.34178
2013	0.90739