Year	Percent
2005	30.31
2007	19.4
2008	17.15
2009	19.09
2010	19.65
2011	19.76
2012	19.81
2013	19.59
2014	18.05
2015	17.55
2016	17.73
2017	16.08
2018	15.19
2019	15.13
2020	17.88