Year	%
2000	18.4
2001	17.8
2002	17.4
2003	17.4
2004	16.1
2005	13.9
2006	14.5
2007	16.3
2008	20.1
2009	22.4
2010	16.7
2011	19.2
2012	15.2
2013	14.6
2014	16
2015	16.1
2016	16
2017	16
2018	16.2
2019	16.3