Year	% of profit
2005	35.5
2006	34.8
2007	32.9
2008	30.1
2009	28.3
2010	27.5
2011	26.8
2012	25.6
2013	26.4
2014	26.7
2015	27.9
2016	28.1
2017	27
2018	26.2
2019	25.3