Year	% of profit
2005	52.1
2006	51.1
2007	50.1
2008	50
2009	47.8
2010	47.6
2011	47.3
2012	47.2
2013	47.3
2014	47.4
2015	47.6
2016	47.6
2017	47.5
2018	47.4
2019	47.4