Year	% gross
1971	51.3263702392578
1972	53.7261009216309
1973	55.4816284179688
1974	57.295581817627
1975	58.9247894287109
1976	62.6334800720215
1977	63.5275802612305
1978	63.4462890625
1979	63.8005294799805
1980	68.9672470092773
1981	75.0023880004883
1982	75.2393493652344
1983	80.723747253418
1984	85.1264801025391
1985	86.5928497314453
1986	89.4015426635742
1987	75.9333572387695
1992	80.5520629882812
1993	84.6440887451172
1994	90.4747161865234
1995	96.9297409057617
1996	103.84529876709
1997	111.403831481934
1998	114.106979370117