Year	Percent
2005	4.6769
2006	2.9293
2007	3.4866
2008	2.6272
2009	3.0454
2010	4.0166
2011	4.5447
2012	3.5711
2013	4.1238
2014	6.0551
2015	4.6698
2016	3.7676
2017	4.1349