Year	%
2003	45.9
2004	46.3
2005	46.1
2006	45.4
2007	44.2
2008	44.1
2009	42.5
2010	43.4
2011	43.8
2012	43.2
2013	43.1
2014	42.6
2015	42.7
2016	42.6
2017	41.6
2018	41.4
2019	40.9
2020	42.1
2021	42.6