Year	% of profit
2005	41.1
2006	41.1
2007	41.1
2008	40.7
2009	40.7
2010	40.7
2011	40.7
2012	40.7
2013	40.7
2014	40.4
2015	39.5
2016	39.5
2017	37.7
2018	37
2019	36.2