Year	Percent
2000	30
2001	30
2002	31
2003	35
2004	34
2005	36
2006	36
2007	37
2008	37
2009	41
2010	42
2011	43
2012	45
2013	44
2014	48
2015	46
2016	44
2017	45
2018	46
2019	46
2020	40