Year	% of profit
2005	45.2
2006	41.6
2007	35.8
2008	33.9
2009	30.4
2010	28
2011	27.2
2012	27.8
2013	27
2014	27
2015	27
2016	27
2017	27.1
2018	27.7
2019	28.3