Year	% gross
1971	19.0751304626465
1972	20.9931793212891
1973	25.3820095062256
1974	29.4117603302002
1976	33.8056716918945
1977	33.1043701171875
1978	35.4363212585449
1979	33.854118347168
1980	32.8419494628906
1981	34.5097618103027
1982	34.7032699584961
1983	36.008430480957
1984	37.9463386535645
1985	39.158618927002
1986	41.8877105712891
1987	41.3616905212402
1988	41.7742614746094
1989	37.5458717346191
1994	38.1079711914062
1995	42.1856307983398
1996	48.165828704834
1997	49.2099113464355
1999	47.6457214355469
2019	64.7269973754883