Year	% gross
1974	10.4055099487305
1975	10.828049659729
1976	12.7526903152466
1977	16.6281299591064
1978	15.116660118103
1979	15.3230895996094
1980	16.5106391906738
1981	18.1193695068359
1982	18.5368804931641
1983	19.6306991577148
1984	20.6888294219971
1985	22.1408290863037
1986	23.6148700714111
1987	25.2021198272705
1988	26.1894798278809
1989	26.0741806030273
1990	25.9878005981445
1991	25.7678909301758
1992	26.196590423584
1993	26.3349609375
1994	26.2322101593018
1995	26.7677898406982
1996	27.3036994934082
1997	25.4184494018555
1998	28.9536895751953
1999	29.9363193511963
2000	31.0934505462646
2001	31.7374496459961
2002	31.4396495819092
2003	32.6729202270508
2004	34.4799880981445
2005	36.3821296691895
2006	39.4634399414063
2007	41.441349029541
2008	43.5326309204102
2009	45.5398101806641
2010	47.9984092712402
2011	51.4034194946289
2012	54.8751602172852
2013	57.2052383422852
2014	57.5929298400879
2015	59.701530456543
2016	61.8511810302734
2017	63.9597702026367
2018	65.1985168457031
2019	66.2062225341797
2020	66.6457138061523