Year	Percent
1996	2.21022
1997	1.25362
1998	1.13697
1999	0.92439
2000	0.61558
2001	0.74019
2002	1.00053
2003	1.06849
2004	1.37384
2005	3.33918
2006	5.21831
2007	9.15911
2008	8.5201
2009	5.60658
2010	3.90245
2011	3.2476
2012	3.1046
2013	2.7377
2014	2.51758
2015	2.38003
2016	2.44531
2017	2.22514