Year	%
2000	31.2
2001	29.5
2002	29
2003	27.7
2004	27.1
2005	26.1
2006	25.2
2007	25
2008	25.8
2009	25
2010	24.5
2011	24.2
2012	24.9
2013	25.3
2014	25.3
2015	25.4
2016	25
2017	25.9
2018	26.1
2019	26.1