Year	% gross
1971	40.3401298522949
1973	40.3922386169434
1978	43.6327514648438
1980	55.3277587890625
1981	58.5295791625977
1982	58.3788909912109
1985	53.0987014770508
1992	51.4581298828125
1994	52.1615180969238
1995	54.8094787597656
1996	55.9825210571289
1997	56.7791404724121
1998	62.4928894042969