Year	% gross
2007	10.7704696655273
2008	12.5381803512573
2010	14.2069396972656
2011	5.94923448562622
2012	9.62003040313721
2013	11.3022899627686
2014	11.1129703521729
2015	11.9264402389526
2016	13.7155199050903
2017	14.4080801010132