Year	% gross
1970	0.2533999979496
1971	0.252829998731613
1972	0.264450013637543
1973	0.284539997577667
1974	0.307909995317459
1975	0.332159996032715
1976	0.376969993114471
1977	0.459160000085831
1978	0.523239970207214
1979	0.652570009231567
1980	0.723420023918152
1981	0.857829988002777
1982	0.934759974479675
1983	0.981880009174347
1984	1.02901995182037
1985	1.13343000411987
1986	1.21896004676819
1987	1.2694000005722
1988	1.26954996585846
1989	1.30175995826721
1990	1.43919003009796
1991	1.58613002300262
1992	1.75460004806519
1993	1.93997001647949
1994	2.14586997032166
1995	2.34381008148193
1996	2.58196997642517
1997	2.84048008918762
1998	3.06159996986389
1999	3.31027007102966
2000	3.79996991157532
2001	4.1361198425293
2002	4.50686979293823
2003	4.84798002243042
2004	5.07281017303467
2005	5.42494010925293
2006	5.48256015777588
2007	5.67609977722168
2008	5.85289001464844
2009	6.04897022247314
2010	6.25971984863281
2011	6.38551998138428
2012	6.71723985671997
2013	7.18726015090942
2014	7.39493989944458
2015	7.55685997009277
2016	7.44323015213013
2017	7.51820993423462
2018	7.7843599319458
2019	8.02795028686523
2020	8.2526798248291