Year	% gross
1972	2.46374988555908
1973	2.54462003707886
1980	1.82658004760742
1983	1.53085005283356
1984	1.84483003616333
1985	1.49401998519897
1986	1.83431994915009
1995	3.2153799533844
1996	3.52136993408203
1998	2.00523996353149
1999	1.95492005348206