Year	Percent
2000	9.6
2001	17
2002	14
2003	15
2004	19
2005	21
2006	23
2007	26
2008	26
2009	26
2010	24
2011	24
2012	25
2013	25
2014	22
2015	22
2016	24
2017	24
2018	24
2019	27
2020	30