Year	%
2006	22.8
2007	23.2
2008	23.5
2009	23.7
2010	24.2
2011	24.6
2012	24.3
2013	24.6
2014	24.7
2015	24.7
2016	24.8
2017	24.7
2018	24.2
2019	24.2
2020	24.3
2021	24