Year	% of profit
2005	37.1
2006	36.6
2007	36.1
2008	33.3
2009	30
2010	30.2
2011	31.8
2012	32
2013	28.7
2014	28.9
2015	28.8
2016	28.8
2017	28.9
2018	29.1
2019	29.2