Year	% of profit
2005	25.8
2006	25.8
2007	25.8
2008	22.8
2009	22.3
2010	22.3
2011	21.8
2012	21.8
2013	21.2
2014	20.7
2015	21.3
2016	20.7
2017	20.7
2018	20.7
2019	20.7