Year	%
2000	27.3
2001	27.1
2002	27.2
2003	28.7
2004	27
2005	27.4
2006	27.2
2007	32.3
2008	34.8
2009	34.9
2010	34.7
2011	35
2012	35
2013	34.8
2014	35
2015	34.8
2016	34.2
2017	34
2018	34.4
2019	33.9