Year	Percent
1998	0.22521
1999	1.28497
2000	0.10431
2001	0.13857
2002	1.7104
2003	0.12094
2004	0.05865
2005	0.09945
2006	0.16568
2007	0.84463
2008	0.39574
2009	1.05106
2010	0.73112
2011	0.42729
2012	3.10458
2013	1.22934
2014	4.12638
2015	0.9406
2016	2.83005