Year	% of profit
2005	28.8
2006	27.6
2007	27.9
2008	27.8
2009	28.7
2010	28.8
2011	28.9
2012	29.4
2013	28.8
2014	28.8
2015	28.8
2016	28.8
2017	28.8
2018	28.8
2019	28.8