Year	Percent
2000	41.9
2001	28.9
2002	30.5
2003	27.1
2004	17.8
2005	12.7
2006	11.1
2007	7.7
2008	6.1
2009	5.4
2010	5.2
2011	7.3
2012	6.3
2013	5.5
2014	4.8
2015	5.1
2016	5.7
2017	5.9
2018	5.6
2019	5
2020	4.8