Year	% of profit
2005	41.1
2006	41.1
2007	41.1
2008	40.9
2009	40.9
2010	40.9
2011	40.9
2012	40.9
2013	40.9
2014	39.9
2015	37.5
2016	35.2
2017	35.2
2018	35.2
2019	35.2