Year	% of profit
2005	22.5
2006	18.1
2007	16.8
2008	16.5
2009	16.5
2010	16.5
2011	16.5
2012	16.5
2013	16.5
2014	15.3
2015	15.3
2016	15.3
2017	15.3
2018	15.3
2019	15.3