Year	Percent
2005	20
2006	19.56
2007	17.16
2008	13.18
2009	15.63
2010	18.76
2011	22.47
2012	23.35
2013	22.05
2014	18.73
2015	17.13
2016	15.54
2017	13.65
2018	12.81
2019	10.42
2020	8.99