Year	% gross
1970	3.47561001777649
1973	3.52488994598389
1974	3.5048201084137
1975	3.52179002761841
1976	4.15931987762451
1977	4.27017021179199
1978	4.35075998306274
1979	4.44454002380371
1980	4.79601001739502
1981	5.0842399597168
1982	7.55113983154297
1983	6.68969011306763
1984	7.84640979766846
1985	8.3954496383667
1986	9.69324016571045
1987	10.6993503570557
1988	11.2913103103638
1990	10.9507598876953
1991	10.2611598968506
1992	10.0543298721313
1993	10.0059995651245
1994	10.2789602279663
1995	10.6396198272705
1997	10.1858901977539
2004	19.0221099853516
2007	23.8660507202148
2010	26.3339996337891
2011	25.2759990692139
2012	25.378999710083
2013	26.9979991912842
2014	26.9400005340576
2016	26.3269996643066
2017	24