Year	% gross
1971	0
1972	0.0287399999797344
1973	0.142859995365143
1974	0.319970011711121
1975	0.225510001182556
1976	0.286379992961884
1977	0.391680002212524
1985	0.697700023651123
1996	0.900269985198975
1997	0.953840017318726
1998	1.19398999214172
2000	1.38887000083923
2001	1.43053996562958
2003	1.74389004707336
2004	2.17935991287231
2005	2.73586010932922
2008	3.48458003997803
2009	3.52014994621277
2010	3.65672993659973
2011	3.66242003440857
2014	5.80199003219604
2015	5.13015985488892
2020	6.47840023040771