Year	% of profit
2005	41.2
2006	41.2
2007	37.2
2008	37.1
2009	34.7
2010	34.7
2011	34.7
2012	34.5
2013	33
2014	33
2015	33
2016	33
2017	33.2
2018	33.2
2019	33.2