Year	%
2000	9
2001	8.6
2002	8.3
2003	8.3
2004	7.9
2005	7.7
2006	7.8
2007	7.7
2008	7.5
2009	7.4
2010	7.3
2011	7.2
2012	7.2
2013	7
2014	6.6
2015	6.7
2016	6.6
2017	6.2
2018	6.3
2019	6.1