Year	Percent
2000	6.64
2001	6.17
2002	6.13
2003	6.5
2004	6.19
2005	4.78
2006	3.56
2007	2.71
2008	3.01
2009	3.43
2010	2.8
2011	2.33
2012	2.32
2013	2.13
2014	2.15
2015	1.43
2016	1.34
2017	0.86