Year	%
2003	15.8
2004	16.4
2005	16.3
2006	16.3
2007	16.8
2008	16.6
2009	16.9
2010	17
2011	16.6
2012	16.5
2013	15.9
2014	16.1
2015	16.4
2016	16.8
2017	17
2018	17.1
2019	16.9
2020	16.8
2021	16.7