Year	%
2000	43.4
2001	42.9
2002	42.5
2003	42.1
2004	41.7
2005	41.3
2006	40.9
2007	40.6
2008	40.4
2009	40.2
2010	40.2
2011	40.3
2012	40.6
2013	41
2014	41.5
2015	42.1
2016	42.7
2017	43.2
2018	43.7
2019	44.2