Year	%
2000	30.1
2001	29.2
2002	29.3
2003	28
2004	26.5
2005	25.9
2006	25.3
2007	24.6
2008	22.8
2009	20.6
2010	18.9
2011	17.9
2012	17.3
2013	16.1
2014	15.7
2015	14.5
2016	13.9
2017	13.5
2018	13.4
2019	13.2