Year	Percent
1980	0.00828
1993	0.22531
1994	0.34428
1995	0.29832
1996	0.26389
1997	0.0825
2004	1.32691
2005	1.07217
2006	0.74766
2007	1.08167
2008	1.15629
2009	0.41683
2010	0.55433
2011	1.01197
2012	0.81543
2013	1.21769
2014	1.16607
2015	1.05414
2016	-1.24367
2017	0.20163