Year	% of profit
2005	20.8
2006	20.8
2007	20.8
2008	20.8
2009	20.8
2010	21.5
2011	21.3
2012	21.2
2013	19.3
2014	18.4
2015	20
2016	20.9
2017	20.6
2018	20.5
2019	20.5