Year	% gross
1971	0
1972	0
1973	0.00358000001870096
1974	0.0266299992799759
1975	0.0100199999287724
1976	0.0159000009298325
1977	0.0216600000858307
1985	0.0657799988985062
1996	0.135000005364418
1997	0.163430005311966
1998	0.190650001168251
2000	0.245299994945526
2001	0.253019988536835
2003	0.199310004711151
2004	0.313659995794296
2005	0.176009997725487
2008	0.512790024280548
2009	0.611469984054565
2010	0.640470027923584
2011	0.878620028495789
2014	1.15638995170593
2015	1.505499958992
2020	2.55031991004944