Year	% gross
1971	0
1972	0.0143299996852875
1973	0.0728600025177002
1974	0.172409996390343
1975	0.117210000753403
1976	0.150590002536774
1977	0.20600999891758
1985	0.381190001964569
1989	0.5903400182724
1996	0.5173299908638
1997	0.558440029621124
1998	0.692219972610474
2000	0.817380011081696
2001	0.842410027980804
2003	0.973710000514984
2004	1.24917995929718
2005	1.45950996875763
2008	2.00573992729187
2009	2.07354998588562
2010	2.157870054245
2011	2.28011989593506
2014	3.49959993362427
2015	3.33451008796692
2020	4.53319978713989