Year	% gross
1971	0.328750014305115
1972	0.359169989824295
1974	0.44582000374794
1979	0.819180011749268
1980	0.859250009059906
1982	0.825699985027313
1983	0.858969986438751
1984	0.838530004024506
1986	1.22895002365112
1987	1.33317005634308
1988	1.23695003986359
1989	1.25845003128052
1990	1.30647003650665
1991	1.29344999790192
1994	0.966650009155273
1995	1.08112001419067
1996	1.13125002384186
1997	1.29545998573303
1998	1.36470997333527
1999	1.51432001590729
2000	1.81669998168945
2001	2.27885007858276
2002	2.41244006156921
2003	3.47145009040833
2004	3.91861009597778
2005	4.24490022659302
2008	5.12547016143799
2009	6.76169013977051
2010	9.40054988861084
2011	9.83883953094482
2012	10.2422199249268
2013	10.7829999923706
2014	10.3430404663086
2015	11.8669996261597
2016	12.83899974823
2017	13.121000289917
2018	12.9549999237061