Year	% gross
1971	0.296920001506805
1972	0.290580004453659
1973	0.285259991884232
1974	0.37924000620842
1975	0.416810005903244
1976	0.513499975204468
1979	0.762510001659393
1980	0.759729981422424
1981	0.683709979057312
1982	0.756959974765778
1984	0.832750022411346
1985	0.86965000629425
1986	0.984539985656738
1987	0.924759984016418
1988	1.1114000082016
1989	1.08798003196716
1990	0.97978001832962
1991	1.13390004634857
1992	1.18471002578735
1993	1.25021994113922
1998	1.27181005477905
1999	1.3406800031662
2000	1.60246002674103
2001	1.55590999126434
2002	2.30796003341675
2004	3.13472008705139
2005	3.17971992492676
2006	3.09180998802185
2010	4.04971981048584
2012	4.09048986434937
2013	5.10426998138428
2014	6.33214998245239
2015	8.11859035491943
2016	5.47953987121582
2017	5.79395008087158
2018	5.8203501701355
2021	7.0770001411438
2022	7.37099981307983