Year	Percent
2005	6.7901
2006	4.5995
2007	4.4073
2008	4.1225
2009	4.3366
2010	5.5918
2011	5.5381
2012	4.6994
2013	5.4914
2014	7.5648
2015	4.6676
2016	6.0713
2017	5.623