Year	Percent
1996	1.93499
1997	2.01236
1998	2.39238
1999	2.14856
2000	2.40975
2001	2.05593
2002	1.88168
2003	2.15094
2004	2.04978
2005	2.09436
2006	2.24415
2007	1.65721
2008	1.3017
2009	1.31909
2010	1.90917
2011	2.26958
2012	2.7851
2013	3.34195
2014	3.40884
2015	3.09395
2016	2.67221
2017	2.02367