Year	Percent
2002	17.14
2003	20.49
2006	28.4
2007	28.04
2008	28.49
2009	26.25
2010	27.8
2011	28.2
2012	25.14
2013	24.08
2014	22.71
2015	20.76
2016	17.71
2017	16.63
2018	16.93
2019	11.81
2020	12.74