Year	%
2000	12.8
2001	11.7
2002	11.5
2003	10.5
2004	10.2
2005	9.5
2006	9.2
2007	8.9
2008	9.2
2009	8.3
2010	7.7
2011	8
2012	8
2013	7.4
2014	7.2
2015	7.1
2016	6.9
2017	7
2018	6.7
2019	6.8