Year	% gross
1971	19.9743900299072
1973	23.9134502410889
1975	25.0406398773193
1977	28.2458000183105
1978	27.1727294921875
1979	30.3004608154297
1980	30.5919990539551
1981	28.1032791137695
1982	34.1738891601562
1983	34.4912300109863
1984	34.5690002441406
1986	34.5545196533203
1987	35.0228691101074
1988	32.7588310241699
1989	31.7959003448486
1990	30.9735794067383
1991	31.9868698120117
1993	33.5092391967773
1998	38.725830078125
1999	39.1473388671875
2000	40.4309310913086
2001	42.9007606506348
2002	46.849178314209
2003	47.3397407531738
2004	46.6260299682617
2005	47.2699203491211
2006	47.7832298278809
2007	49.4005393981934
2008	49.1920204162598
2009	51.3838691711426
2010	53.8753509521484
2011	53.4418907165527
2012	55.0080490112305
2013	53.1885795593262
2014	53.3411407470703
2015	51.4578285217285
2016	50.8637008666992
2017	49.5326499938965
2018	47.8451118469238
2019	45.3914413452148
2020	46.2368087768555
2021	48.4385299682617