Year	% gross
1971	11.4583301544189
1972	13.8481397628784
1977	24.6072597503662
1988	33.5382614135742
2003	39.4084892272949
2004	40.8857917785645
2005	44.9088096618652
2007	48.597339630127
2008	45.4602394104004
2009	52.2678184509277
2010	51.0041389465332
2011	52.2468605041504
2012	59.6949882507324
2013	66.0942230224609
2014	76.9501419067383
2015	85.4171295166016
2016	87.6984710693359
2017	94.95166015625