Year	% of profit
2005	39.9
2006	39.9
2007	39.9
2008	39.9
2009	40
2010	33.1
2011	39.9
2012	35.3
2013	40.8
2014	40.8
2015	39.4
2016	39.4
2017	38.1
2018	37.8
2019	37.6