Year	% gross
2005	15.9397096633911
2006	16.1528301239014
2007	14.9215803146362
2008	17.4811305999756
2009	16.5671405792236
2012	14.5845603942871
2013	17.5996398925781
2014	19.6387004852295
2015	21.0842208862305