Year	% of profit
2005	26.2
2006	26
2007	24.2
2008	25.8
2009	26
2010	26.5
2011	28.3
2012	26.9
2013	23.6
2014	23.6
2015	21.5
2016	21.8
2017	21.9
2018	22.1
2019	22.2