Year	%
2001	14.8
2002	13.3
2003	10.2
2004	8.3
2005	7.5
2006	3.9
2007	2.4
2008	2.3
2009	1.3
2010	1.1
2011	0.9
2012	0.5
2013	0.4
2014	0.4
2015	0.3