Year	%
2000	16.4
2001	15.5
2002	14.8
2003	15.9
2004	15.9
2005	17.2
2006	18.5
2007	19.1
2008	19.1
2009	19.5
2010	19
2011	19.7
2012	21.2
2013	22.6
2014	24.7
2015	25.6
2016	26
2017	24.9
2018	23.5
2019	22.1