Year	%
2003	28.4
2004	25.9
2005	26.2
2006	26.9
2007	24
2008	24.9
2009	24.4
2010	24.3
2011	24.8
2012	25.2
2013	26.6
2014	26.3
2015	24.4
2016	23.1
2017	22.5
2018	22.4
2019	23.3
2020	23.5
2021	24.3