Year	% of profit
2005	34.7
2006	34.8
2007	34.8
2008	33.2
2009	33.2
2010	33.2
2011	33.2
2012	33.2
2013	31.1
2014	31.1
2015	31.1
2016	31.1
2017	31.1
2018	31.1
2019	31.1