Year	% gross
1971	11.6567497253418
1972	15.6639995574951
1973	15.5301904678345
1974	14.6461801528931
1975	16.4208793640137
1976	18.0445499420166
1977	25.116720199585
1978	20.0160102844238
1979	21.331169128418
1980	22.5854797363281
1981	23.1768493652344
1982	27.8283596038818
1983	24.7681407928467
1984	25.4632606506348
1985	22.7847309112549
1986	19.0720996856689
1987	16.5585403442383
1988	17.3360996246338
1989	18.2325706481934
1990	18.9914798736572
1991	16.2220802307129
1992	17.9266395568848
1993	19.2257595062256
1994	22.7497692108154
1995	22.8454093933105
1996	23.6073703765869
1997	25.8062305450439
1998	27.4906101226807
1999	26.2168197631836
2000	28.3712997436523
2001	28.8567295074463
2002	33.1051406860352
2003	36.6863212585449
2004	36.2548217773438
2005	39.4885902404785
2006	40.6419906616211
2007	44.077449798584
2008	52.6988983154297
2009	55.0545501708984
2011	55.4416007995605
2013	51.7470283508301
2014	54.6743812561035
2015	57.590950012207
2016	59.260929107666
2017	60.0672302246094
2018	60.2674102783203
2019	60.7908897399902
2020	62.4533805847168
2021	53.9965209960938