Year	Percent
2006	28.09
2007	26.04
2008	21.23
2009	21.87
2010	24.95
2011	25.4
2012	25.68
2013	25.55
2014	25.9
2015	25.48
2016	23.76
2017	19.7
2018	17.83
2019	15.88
2020	14.67