Year	%
2000	27.6
2001	26.4
2002	26.4
2003	25.4
2004	23.8
2005	23
2006	22.1
2007	21.4
2008	20
2009	18.7
2010	17.3
2011	16
2012	14.9
2013	13.7
2014	12.8
2015	11.7
2016	11.2
2017	10.8
2018	10.8
2019	10.7