Year	%
2000	35.3
2001	35.6
2002	36
2003	36.1
2004	36.2
2005	36.3
2006	36.3
2007	36.2
2008	36.3
2009	36.2
2010	36.1
2011	35.9
2012	35.7
2013	35.5
2014	35.8
2015	35.4
2016	34.5
2017	34.2
2018	33.8
2019	33.7