Year	% gross
1970	9.05337047576904
1971	9.69221019744873
1972	10.4532098770142
1973	11.0959300994873
1974	11.7793102264404
1975	12.7924003601074
1976	13.5618696212769
1977	14.1184396743774
1978	14.7459497451782
1979	15.3120403289795
1980	15.9893102645874
1981	16.1817493438721
1982	16.8181495666504
1983	17.6784591674805
1984	18.3346004486084
1985	17.7030696868896
1986	19.3184795379639
1987	20.7122001647949
1988	21.8730907440186
1989	23.054479598999
1990	24.2187595367432
1991	25.6484603881836
1992	27.3327903747559
1993	27.979320526123
1994	28.2240505218506
1995	30.4371109008789
1996	32.7564506530762
1997	31.7470397949219
1998	33.0113105773926
1999	33.295539855957
2000	31.4077205657959
2001	33.1645393371582
2002	35.5663604736328
2003	39.9601287841797
2004	43.5407409667969
2005	46.8561897277832
2006	49.6646995544434
2007	50.3431396484375
2008	52.9987106323242
2009	55.4525718688965
2010	58.5897216796875
2011	59.4013214111328
2012	57.5912399291992
2013	58.2438583374023
2014	59.8279418945313
2015	60.9331207275391
2016	63.6871299743652
2017	66.6883697509766
2018	63.6495018005371
2019	67.9033813476563
2020	66.2236099243164