Year	% gross
2005	15.9504404067993
2006	16.5445995330811
2007	15.2349996566772
2008	17.1306896209717
2009	16.8414001464844
2012	14.6490201950073
2013	17.523250579834
2014	20.0052108764648
2015	21.4478702545166