Year	Percent
2005	4.88
2006	3.65
2007	3.41
2008	3
2009	4.25
2010	5.67
2011	3.88
2012	3.4
2013	3.1
2014	2.84
2015	3.53
2016	4.6
2017	3.89
2018	4.32
2019	3.04
2020	3.22