Year	Percent
2001	13
2002	24
2003	19
2004	18
2005	15
2006	27
2008	29
2009	37
2010	28
2011	24
2012	34
2013	36
2014	42
2015	43
2016	42
2017	39
2018	43
2019	47
2020	48