Year	%
2000	29
2001	28.2
2002	27.3
2003	26.6
2004	25.8
2005	25
2006	24.3
2007	23.5
2008	22.9
2009	22.3
2010	21.9
2011	21.9
2012	22.1
2013	22.3
2014	22.6
2015	23
2016	23.5
2017	24
2018	24.2
2019	24.5