Year	% of profit
2005	39.1
2006	35.3
2007	32.1
2008	31.9
2009	31.9
2010	31.9
2011	32.9
2012	32.8
2013	32.7
2014	32.7
2015	32.7
2016	32.7
2017	33.2
2018	32.4
2019	55.4