Year	% gross
1971	129.433456420898
1974	128.259124755859
1978	83.8927001953125
1980	104.281227111816
1981	107.688217163086
1982	105.332397460938
1983	100.903778076172
1985	84.955451965332
1987	97.9430999755859
1989	81.77001953125
1992	77.1892623901367
1993	76.5738220214844
1994	78.9991836547852
1995	79.324951171875
1996	78.8449172973633
1997	80.9443435668945
1998	83.5560989379883