Year	% gross
1970	23.4448699951172
1971	24.9376602172852
1972	26.5199699401855
1973	29.065580368042
1974	31.402250289917
1975	35.7019386291504
1976	37.9107513427734
1977	39.3972816467285
1979	39.189338684082
1980	40.0811309814453
1981	42.4036712646484
1982	44.2409515380859
1983	45.2494583129883
1984	48.1718597412109
1985	50.8299903869629
1986	53.0375518798828
1987	57.2631912231445
1988	60.6769981384277
1991	48.567008972168
1994	47.7186393737793
1996	52.2438201904297
1997	53.4072418212891
1998	54.8363800048828
1999	55.5328598022461
2000	58.7351989746094
2001	59.5718116760254
2002	60.2409515380859
2003	60.6165618896484
2004	62.3003311157227
2005	63.7470092773438
2006	63.6760482788086
2007	64.6376266479492
2008	66.6050033569336
2009	68.0510406494141
2010	68.8922500610352
2011	68.8740463256836
2012	70.5896530151367
2013	72.2495727539063
2014	73.2491989135742
2015	74.6931610107422
2016	75.3311920166016
2017	76.0847320556641
2018	77.2012100219727
2019	77.7788314819336
2020	76.186653137207