Year	% gross
1971	13.8919801712036
1972	14.4948797225952
1973	14.889479637146
1974	15.1502504348755
1975	15.3647804260254
1976	15.4795999526978
2010	99.1213607788086
2011	108.564521789551
2012	99.5488967895508
2013	54.8588218688965
2014	37.7828483581543
2015	37.6272010803223
2016	37.5336608886719