Year	Percent
2000	12.6462
2001	18.1061
2002	14.6943
2003	11.4305
2004	10.7792
2005	8.8517
2006	7.5457
2007	6.356
2008	5.0369
2009	5.8309
2010	9.2797
2011	9.4457
2012	11.4517
2013	13.3076
2014	12.803
2015	9.3937
2016	8.0138
2017	6.454