Year	% gross
1971	32.5368118286133
1972	31.8433494567871
1973	30.0406703948975
1974	28.5662002563477
1975	27.3336391448975
1976	26.5074996948242
1977	26.7622699737549
1978	28.4408302307129
1979	29.6792106628418
1980	30.572660446167
1981	31.2133007049561
1982	34.4149894714355
1983	38.3597984313965
1984	40.6940307617188
1985	42.3747100830078
1986	45.0051002502441
1987	43.3934707641602
1988	43.8309288024902
1989	46.4115982055664
1990	46.1959915161133
1991	45.9684410095215
1992	46.0503807067871
1993	48.4182586669922
1994	52.3687705993652
1995	55.9709091186523
1996	59.4913597106934
1997	60.4879989624023
1999	68.4164886474609
2000	69.0998306274414
2001	71.2857208251953
2002	73.5244216918945
2003	71.9708862304688
2005	78.0030975341797
2006	80.070671081543
2008	85.1157531738281
2009	83.3356018066406
2010	83.31298828125
2011	86.1971130371094
2016	86.6266479492188