Year	Percent
2000	5.32611
2001	6.78367
2002	6.21535
2003	4.69668
2004	3.78074
2005	3.1665
2006	2.79267
2007	2.33486
2008	1.7701
2009	1.96904
2010	3.20103
2011	3.74927
2012	4.05761
2013	4.41021
2014	4.06674
2015	3.24148
2016	2.5524
2017	2.0776