Year	% gross
1971	7.30142021179199
1972	7.56443023681641
1973	8.00162029266357
1974	9.03137016296387
1975	10.097620010376
1976	11.1449403762817
1977	12.8736200332642
1978	14.5003700256348
1979	17.5676498413086
1980	17.813289642334
1981	21.7956695556641
1982	24.4411697387695
1983	27.5155906677246
1984	33.0073013305664
1985	35.2509117126465
1986	37.6841201782227
1987	40.4256401062012
1988	42.1549797058105
1989	41.5102615356445
1990	42.9890785217285
1991	42.7318916320801
1992	45.017578125
1993	46.9776496887207
1994	44.2120018005371
1995	47.7770805358887
1996	50.6516494750977
1997	53.8309898376465
1998	57.1760902404785
1999	61.0808982849121
2000	63.3466110229492
2001	66.1750793457031
2002	68.6442337036133
2003	69.0464935302734
2004	71.0054931640625
2005	73.7947006225586
2006	82.8578720092773
2007	92.2044677734375
2008	39.9041595458984
2009	45.3663597106934
2010	48.0371208190918
2011	52.6246604919434
2012	56.3006706237793
2013	63.893310546875
2014	72.6210327148438
2015	72.9755477905273
2016	72.9783401489258
2017	70.435791015625
2018	66.1367492675781
2019	62.9829711914063
2020	56.0483016967773
2021	55.2859191894531