Year	% of profit
2005	19.3
2006	19.3
2007	19.3
2008	18.4
2009	18.4
2010	18.4
2011	18.4
2012	18.4
2013	18.4
2014	18.1
2015	18.1
2016	18.5
2017	19.3
2018	19.3
2019	19.3