Year	% of profit
2005	35.7
2006	34
2007	34
2008	34
2009	34.4
2010	34
2011	34.4
2012	34.6
2013	34.7
2014	34.7
2015	34.7
2016	34.7
2017	34.7
2018	34.7
2019	34.7