Year	%
2000	10.6
2001	10.1
2002	9.9
2003	9.5
2004	9
2005	8.5
2006	7.9
2007	7.5
2008	7.1
2009	6.7
2010	6.4
2011	6.1
2012	5.7
2013	5.5
2014	5.3
2015	5.1
2016	5
2017	4.7
2018	4.6
2019	4.4