Year	%
2000	46.1
2001	45.9
2002	45.8
2003	45.6
2004	45.5
2005	45.3
2006	45.1
2007	44.8
2008	44.5
2009	44.3
2010	44
2011	43.8
2012	43.5
2013	43.2
2014	42.9
2015	42.6
2016	42.4
2017	42.1
2018	41.7
2019	41.4