Year	% of profit
2005	36.8
2006	32.5
2007	31.6
2008	33.9
2009	32.3
2010	30.2
2011	34.1
2012	34
2013	33.4
2014	33.2
2015	33.2
2016	33.1
2017	33.1
2018	33.1
2019	33.2