Year	% of profit
2005	35.2
2006	35.2
2007	35.2
2008	33.5
2009	31.4
2010	31.4
2011	31.4
2012	31.4
2013	26.3
2014	25.8
2015	25.3
2016	26.2
2017	26.2
2018	24.1
2019	24.1