Year	% gross
1970	5.10835981369019
1971	5.73730993270874
1972	5.49348020553589
1973	5.66793012619019
1974	5.28198003768921
1975	6.7497501373291
1976	6.81941986083984
1977	7.38111019134521
1978	8.44279003143311
1979	9.3124303817749
1980	10.9077997207642
1981	12.1169700622559
1982	14.8111801147461
1983	13.3927297592163
1984	14.1582698822021
1985	14.1660499572754
1986	14.3327598571777
1987	14.3019504547119
1988	16.8664798736572
1989	17.3797607421875
1990	17.038610458374
1991	17.7060394287109
1992	17.8594207763672
1993	18.4921398162842
1994	17.9551296234131
1995	18.5934295654297
1996	18.8731899261475
1997	18.6640396118164
1998	19.4027099609375
1999	22.7800598144531
2000	24.1059894561768
2001	24.4497108459473
2002	24.4044895172119
2003	25.7279205322266
2004	27.0199909210205
2005	31.5389595031738
2006	34.6663513183594
2007	40.8843994140625
2008	43.4664001464844
2009	45.4984893798828
2010	41.4427680969238
2011	43.0880088806152
2012	50.0097885131836
2013	54.3466186523438
2014	57.8752899169922
2015	47.3484077453613
2016	61.8764381408691
2017	63.1930694580078
2018	62.3436584472656