Year	Percent
1996	0.25904
1997	0.32938
2001	1.3166
2002	4.05632
2003	3.73855
2004	4.01896
2005	8.4037
2006	5.65515
2007	10.6452
2008	3.73896
2009	2.50689
2010	2.34968
2011	2.22634
2012	2.74193
2013	3.75753
2014	3.72964
2015	3.83071
2016	4.37655