Year	% gross
1971	12.0304098129272
1972	11.7229995727539
1973	11.5942697525024
1974	11.9759101867676
1975	14.1305503845215
1976	17.0442295074463
1977	16.9705200195312
1978	16.5756092071533
1979	16.3278694152832
1980	16.6915493011475
1981	18.1243305206299
1982	19.536600112915
1983	20.9504108428955
1984	21.1011199951172
1985	22.0167999267578
1986	22.8117408752441
1987	23.8583202362061
1988	25.281530380249
1989	27.08251953125
1990	28.2458190917969
1991	28.9975299835205
1992	31.887020111084
1993	34.1366195678711
1994	37.343620300293
1995	38.798038482666
1996	40.5706481933594
1997	41.8280906677246
1998	45.375789642334
1999	47.3059997558594
2000	49.4498100280762
2001	50.6748008728027
2002	53.5348014831543
2003	55.8461685180664
2004	58.9219093322754
2005	58.8693199157715
2006	58.4411811828613
2007	58.3019905090332
2008	54.0174713134766
2009	56.503978729248
2010	63.1264381408691
2011	67.7985916137695
2012	68.1972503662109
2013	71.6995468139648
2014	73.813232421875
2015	77.2321472167969
2016	77.5571365356445
2017	77.7806167602539
2018	77.2828826904297
2019	75.1799392700195
2020	74.6803131103516
2021	78.7776031494141