Year	% of profit
2005	32.6
2006	30.8
2007	31.3
2008	28.5
2009	27.6
2010	27.5
2011	25.7
2012	26.3
2013	25.6
2014	25.4
2015	23.9
2016	24.4
2017	23.8
2018	23.8
2019	23.8