Year	% of profit
2005	39
2006	39
2007	39
2008	39
2009	38.8
2010	38.8
2011	35.9
2012	35.9
2013	32
2014	32.3
2015	32.3
2016	32.3
2017	32.3
2018	30.6
2019	30.6