Year	% gross
1970	18.8758506774902
1971	20.8325099945068
1972	24.7942008972168
1973	28.3904209136963
1974	31.5209503173828
1975	34.2298889160156
1976	34.7105293273926
1977	36.4374504089355
1998	46.0514297485352
1999	45.7177696228027
2000	43.8961181640625
2001	44.007381439209
2002	44.2733688354492
2003	43.7323608398438
2004	48.4555892944336
2005	49.7005195617676
2006	53.6245994567871
2007	61.1017417907715
2009	59.6640014648438
2010	65.4768905639648
2011	69.6596221923828
2012	72.8746337890625
2013	74.9233322143555
2014	77.6130981445312
2015	79.9569091796875
2016	86.6399230957031