Year	% gross
1973	9.82664012908936
1974	9.74794960021973
1975	9.96368980407715
1976	12.6026096343994
1977	18.2937698364258
1978	15.7443399429321
1979	15.9539604187012
1980	17.6399002075195
1981	20.4223709106445
1982	20.794750213623
1983	22.3001194000244
1984	23.8357906341553
1985	26.0513591766357
1986	28.3841094970703
1987	31.0652198791504
1988	32.0902290344238
1989	31.8051109313965
1990	31.6269702911377
1991	31.0354404449463
1992	31.5317707061768
1993	31.750919342041
1994	31.2049598693848
1995	32.1033515930176
1996	33.1564292907715
1997	34.723461151123
1998	44.9055290222168
1999	47.4410705566406
2000	47.6723403930664
2001	47.9532203674316
2002	45.7408218383789
2003	45.6750602722168
2004	46.3477096557617
2005	47.2876396179199
2006	49.2358207702637
2007	50.9636116027832
2008	53.5858383178711
2009	55.7513618469238
2010	59.5581817626953
2011	64.1990509033203
2012	69.8345565795898
2013	73.0125579833984
2014	75.7009429931641
2015	77.574951171875
2016	80.5723114013672
2017	82.8143310546875
2018	85.3296890258789
2019	86.0865783691406
2020	86.9579620361328