Year	% gross
1999	2.07131004333496
2006	4.4143500328064
2007	4.65101003646851
2008	5.2915301322937
2009	5.69246006011963
2010	7.64600992202759
2016	9.07145023345947
2017	9.77960014343262
2018	8.53092956542969