Year	% gross
1971	0.440560013055801
1972	0.682910025119781
1973	0.694530010223389
1974	0.678820013999939
1975	0.73199999332428
1976	1.04297995567322
1977	1.20678997039795
1978	1.34249997138977
1979	1.31892001628876
1980	1.47959005832672
1981	1.87659001350403
1982	1.64546000957489
1983	1.48483002185822
1984	1.50121998786926
1987	1.98108005523682
1988	2.1810998916626
1989	2.21579003334045
1990	2.2464599609375
1991	2.48679995536804
1992	2.73692011833191
1993	2.30610990524292
1994	2.49405002593994
1995	2.82730007171631
1996	2.80788993835449
1998	3.19122004508972
2006	5.08456993103027
2007	5.70411014556885
2010	9.12454032897949
2011	9.90192985534668
2012	10.9630603790283
2013	11.0933198928833
2014	10.7719402313232
2015	11.0391302108765
2016	12.3244800567627
2017	12.5233001708984
2018	13.0981397628784
2019	13.3234195709229
2020	15.0659399032593