Year	%
2000	16.5
2001	15.8
2002	15.5
2003	14.9
2004	14.3
2005	13.5
2006	12.7
2007	12.2
2008	11.6
2009	11
2010	10.6
2011	10
2012	9.5
2013	9
2014	8.7
2015	8.4
2016	8.2
2017	7.8
2018	7.5
2019	7.3