Year	Percent
2006	13.66
2007	15.98
2008	13.96
2009	14.68
2010	14.65
2011	16.16
2012	15.38
2013	16.46
2014	13.27
2015	14.61
2016	15.86
2017	11.17
2018	10.46
2019	8.74
2020	9.85