Year	% of profit
2005	36.6
2006	36.6
2007	36.6
2008	36.6
2009	36.6
2010	36.8
2011	37.6
2012	36.8
2013	36.7
2014	36.9
2015	34.7
2016	35.1
2017	35.2
2018	35.7
2019	35.8