Year	% gross
1970	0.891369998455048
1971	0.944310009479523
1972	1.06712996959686
1973	1.25136005878448
1975	1.64820003509521
1978	1.74103999137878
1979	2.40145993232727
1987	2.5881199836731
1999	7.50256013870239
2000	18.0450897216797
2010	9.40750026702881
2012	11.2590703964233