Year	Percent
1993	0.46536
1994	2.50048
1995	2.82851
1996	3.28758
1997	4.12467
1998	3.355
1999	2.98217
2000	3.63615
2001	2.864
2002	2.7749
2003	2.84839
2004	2.59712
2005	2.79249
2006	2.66924
2007	2.75394
2008	2.55755
2009	2.84032
2010	2.74203
2011	2.25832
2012	2.35344
2013	2.39292
2014	3.02114
2015	3.97326
2016	3.67198
2017	3.41297