Year	% gross
1999	2.5803599357605
2003	3.23369002342224
2004	4.35312986373901
2008	25.0844192504883
2013	22.8934803009033
2014	20.1594295501709
2016	16.0335578918457
2017	20.0753307342529
2018	21.4662609100342