Year	% gross
1971	2.47218990325928
1972	2.47769999504089
1973	2.51765990257263
1974	2.8517599105835
1975	3.14154005050659
1976	3.61467003822327
1977	4.17062997817993
1978	4.66800022125244
1979	5.31396007537842
1980	6.52480983734131
1981	7.7426700592041
1982	18.5666904449463
1983	21.1610794067383
1984	26.76708984375
1985	33.503719329834
1986	41.6140403747559
1987	46.6150703430176
1988	51.830020904541
1989	53.108699798584
1990	55.4546318054199
1991	58.5368995666504
1992	63.9474296569824
1993	72.4137420654297
1994	79.2645492553711
1995	86.1798400878906
1996	86.5036697387695
2013	92.843620300293
2014	92.6872329711914
2015	93.9874801635742
2016	96.6409378051758
2017	94.9851989746094
2018	93.524787902832
2019	92.2443313598633
2020	91.7819137573242