Year	% of profit
2005	42.8
2006	42.7
2007	42.8
2008	42.8
2009	25.9
2010	22.2
2011	23.6
2012	23.6
2013	22.2
2014	23.3
2015	23.3
2016	22.6
2017	23.7
2018	23.7
2019	23.7