Year	%
2000	12.1
2001	11.8
2002	12.9
2003	13.3
2004	13.9
2005	13.5
2006	14.4
2007	14.6
2008	14.7
2009	14.7
2010	14.5
2011	14.7
2012	15.2
2013	16
2014	16.9
2015	17.4
2016	17.5
2017	17.1
2018	16.6
2019	16.2