Year	% of profit
2005	36.8
2006	36.794117647058826
2007	36.85882352941176
2008	35.194117647058825
2009	32.95294117647059
2010	32.34117647058823
2011	32.758823529411764
2012	32.888888888888886
2013	34.255
2014	33.99
2015	33.825
2016	34.13
2017	33.85
2018	33.705
2019	33.76