Year	% gross
1970	10.3789701461792
1971	10.2049503326416
1972	10.0456800460815
1973	9.93369960784912
1974	9.93562984466553
1975	10.3631200790405
1976	12.2487096786499
1977	16.0448398590088
1978	14.6067399978638
1979	14.840259552002
1980	16.0352191925049
1981	17.597770690918
1982	18.0486106872559
1983	19.0773391723633
1984	20.0992794036865
1985	21.3757190704346
1986	22.9011993408203
1987	24.5257301330566
1988	25.4141502380371
1989	25.3118591308594
1990	25.2162799835205
1991	25.1585102081299
1992	25.5004806518555
1993	25.6328105926514
1994	25.54660987854
1995	26.1004505157471
1996	26.6643295288086
1997	24.8891792297363
1998	28.4303207397461
1999	29.3612003326416
2000	30.530969619751
2001	31.2838897705078
2002	31.1031303405762
2003	32.3297386169434
2004	34.1707992553711
2005	36.1457290649414
2006	39.2036514282227
2007	41.1441307067871
2008	43.2642517089844
2009	45.2864608764648
2010	47.8413581848145
2011	51.3425216674805
2012	54.8972206115723
2013	57.2582588195801
2014	57.5840911865234
2015	59.6295204162598
2016	61.7392692565918
2017	63.8362312316895
2018	65.0639495849609
2019	66.0440826416016
2020	66.2150726318359