Year	% gross
1971	4.56842994689941
1972	6.3486499786377
1973	7.45122003555298
1974	7.85558986663818
1975	12.6956195831299
1976	18.4256000518799
1979	26.2628002166748
1982	34.9196281433105
1984	37.702808380127
1985	38.423698425293
1986	39.0443305969238
1987	36.9594192504883
1988	36.7678108215332
1989	36.4454002380371
1990	36.756721496582
1991	40.3504295349121
1992	42.0798187255859
1993	41.8195686340332
1994	41.8467483520508
1995	43.2318305969238
1996	41.5068283081055
1997	44.1428985595703
1999	44.2638816833496
2000	48.0516395568848
2001	49.9748115539551
2002	51.5814781188965
2003	52.6201705932617
2004	54.1593284606934
2005	57.4750099182129
2006	59.4830513000488
2007	61.4348297119141
2008	68.807487487793
2009	80.182243347168
2010	70.8289337158203
2011	71.7295074462891
2012	72.4579620361328
2013	75.749267578125
2014	73.2363510131836
2015	75.763786315918
2016	70.5185165405273
2017	69.053581237793