Year	Percent
2003	13.23997
2004	12.43698
2005	15.06238
2006	14.21796
2008	17.30664
2009	20.19652
2010	15.24342
2011	14.43893
2012	15.03094
2013	15.32418
2014	13.99103
2015	17.24934
2016	14.75074