Year	%
2000	36.8
2001	35.1
2002	34
2003	33
2004	32.3
2005	31.6
2006	30.8
2007	29.7
2008	28.9
2009	28.3
2010	27.9
2011	27.5
2012	27.2
2013	26.8
2014	26.3
2015	25.8
2016	25.5
2017	25.2
2018	25.1
2019	25