Year	% of profit
2005	41.5
2006	41.5
2007	41.5
2008	41.5
2009	41.2
2010	39.3
2011	38.3
2012	37.6
2013	31.1
2014	31.1
2015	31.1
2016	33.1
2017	32
2018	32.2
2019	32.1