Year	% of profit
2005	15.4
2006	15.4
2007	15
2008	15
2009	15
2010	14.3
2011	14.4
2012	16.2
2013	15.9
2014	15.5
2015	18.6
2016	18.6
2017	15.6
2018	15.6
2019	15.6