Year	%
2000	25.3
2001	25
2002	26
2003	24.3
2004	24.5
2005	22.6
2006	21.3
2007	19.1
2008	19.3
2009	19.1
2010	21.1
2011	22.4
2012	24
2013	25
2014	25.5
2015	25.1
2016	24.3
2017	23.9
2018	23.2
2019	22.8