Year	% gross
1971	11.6499996185303
1973	10.0906496047974
1974	8.99087047576904
1975	15.995400428772
1976	15.6511898040771
1999	35.6001281738281
2013	27.2012367248535
2014	28.0492877960205
2015	32.1205406188965
2016	28.3173542022705
2017	29.7993869781494
2018	29.469409942627
2019	6.78013801574707
2020	5.96240186691284
2021	5.88564252853394