Year	% gross
1971	6.41508007049561
1972	7.0130500793457
1973	8.98204040527344
1975	20.056640625
1976	24.2223606109619
1979	30.3812007904053
1980	32.174388885498
1981	32.9221496582031
1982	30.8701801300049
1983	29.1223392486572
1984	29.5908393859863
1985	30.3376407623291
1988	27.2304801940918
1989	23.9757099151611
1990	18.959939956665
1991	19.4389305114746
1995	17.9682102203369
1997	18.3899097442627
2008	38.3230590820312
2012	39.4205207824707
2013	40.0047416687012
2015	44.9455184936523
2018	48.327880859375
2019	48.0878791809082
2020	57.9376602172852