Year	% gross
1971	9.04973030090332
1972	9.54197978973389
1973	10.3160200119019
1974	10.8484897613525
1975	11.1734399795532
1976	11.4678401947021
1977	11.9285001754761
1978	12.1656999588013
1979	12.6216897964478
1980	12.2088804244995
1981	13.5964002609253
1984	17.1977100372314
1985	18.2953491210938
1986	16.7345409393311
1988	18.793140411377
1989	16.1843891143799
1990	16.0375995635986
1991	15.2546901702881
2001	24.6340103149414
2011	39.1531982421875
2012	43.14794921875
2013	37.9642715454102
2015	38.5105590820312
2016	40.7056884765625
2017	40.0794486999512
2018	41.5716514587402
2019	58.9547309875488
2020	60.2446899414062
2021	70.7281265258789