Year	% of profit
2005	24.1
2006	24.1
2007	24.1
2008	24.1
2009	23
2010	23
2011	23
2012	23
2013	22.6
2014	22.8
2015	22.8
2016	22.9
2017	22.9
2018	22.9
2019	21.9