Year	%
2006	41.8
2007	43
2008	41
2009	40.9
2010	42.2
2011	41.1
2012	42.7
2013	42.9
2014	43.9
2015	44.3
2016	46.4
2017	46.6
2018	47.6
2019	46.6
2020	47.4
2021	45.6