Year	%
2000	32.8
2001	32.5
2002	31.4
2003	31.1
2004	31.1
2005	29.8
2006	30.5
2007	28.7
2008	28.8
2009	26.9
2010	27.6
2011	26.7
2012	27.5
2013	27.4
2014	26.1
2015	26
2016	25.4
2017	24.8
2018	24.9
2019	25.2