Year	% of profit
2005	30.9
2006	30.9
2007	30.9
2008	29.2
2009	29.2
2010	31.2
2011	31.2
2012	31.2
2013	31.2
2014	35.6
2015	36.6
2016	36.7
2017	36.7
2018	36.6
2019	36.6