Year	Percent
1997	1.18316
1998	3.28037
1999	1.81986
2000	1.92229
2001	1.13572
2002	0.13715
2003	0.30813
2004	18.54303
2005	0.89767
2006	-1.62847
2007	10.46902
2008	2.80739
2009	-1.21845
2010	3.87699
2011	-4.64559
2012	0.85984
2013	0.98505