Year	% gross
1976	0
1981	0
1986	0
1991	0
1992	0.0525100007653236
1993	0.119599997997284
1994	0.127680003643036
1996	0.199230000376701
1997	0.22393000125885
1999	0.250759989023209
2000	0.242239996790886
2001	0.548489987850189
2002	0.834020018577576
2003	0.936230003833771
2004	1.29159998893738
2005	1.80897998809814
2006	1.96572995185852
2007	2.21101999282837
2008	2.34465003013611
2009	2.99175000190735
2010	2.9682400226593
2011	4.18748998641968