Year	% of profit
2005	36
2006	36
2007	36
2008	34.5
2009	33.5
2010	33.9
2011	34.1
2012	34.6
2013	39.1
2014	39.3
2015	40
2016	40
2017	39.2
2018	39.2
2019	38.7