Year	% of profit
2006	33.2
2007	33.2
2008	33.8
2009	30.1
2010	29.2
2011	24.6
2012	21.8
2013	21.8
2014	21.8
2015	21.8
2016	22.2
2017	22.1
2018	22.2
2019	22.2