Year	% gross
1971	34.9470710754395
1972	32.9677696228027
1973	36.5007400512695
1974	38.2434005737305
1975	40.5503387451172
1976	41.8199501037598
1977	43.844841003418
1978	46.2827110290527
1979	46.7907295227051
1980	49.2687301635742
1981	33.4265403747559
1982	42.478588104248
1983	43.0808486938477
1984	43.8538703918457
1985	51.7031211853027
1986	56.9306182861328
1987	54.9938697814941
1988	54.5478706359863
1989	54.1188011169434
1990	53.5597610473633
1991	55.4553108215332
1992	60.4357299804688
1993	51.4007797241211
2001	69.8820114135742
2002	70.9740829467773
2005	68.5949478149414
2006	70.2325286865234
2007	70.8808517456055
2008	71.8160705566406
2009	69.8742218017578
2010	73.3080978393555
2011	71.1243515014648
2012	71.4789581298828
2013	71.7853698730469
2014	70.1205062866211
2015	73.010009765625
2018	75.9917297363281
2020	73.4222869873047
2021	65.6098480224609