Year	%
2000	33
2001	31
2002	31.9
2003	32
2004	31.4
2005	32.3
2006	31.2
2007	30.1
2008	29.2
2009	29.6
2010	29.9
2011	27
2012	26.2
2013	25.2
2014	25.6
2015	26.6
2016	25.9
2017	24.4
2018	24.5
2019	24.1