Year	% gross
1978	0.00518999993801117
1979	0.00491000013425946
1980	0.0023199999704957
1981	0
1982	0.00209999992512167
1983	0.0020000000949949
1984	0.0518100000917912
1985	0.271019995212555
1986	0.641830027103424
1987	1.38028001785278
1988	2.06657004356384
1989	3.03711009025574
1990	3.85675001144409
1991	4.08128023147583
1992	4.92129993438721
1993	4.83644008636475
1994	5.13886976242065
1995	5.6378002166748
1996	5.10306978225708
1997	5.99481010437012
1998	7.12744998931885
2003	12.1856899261475
2004	16.084379196167
2005	18.1676807403564
2006	20.3098106384277
2007	21.8022804260254
2009	25.835880279541
2010	30.4687404632568
2011	34.8990707397461
2013	42.6161308288574
2014	52.0412406921387
2015	57.8076400756836
2016	62.3419189453125
2017	57.0111389160156
2018	57.4878082275391
2019	56.3356094360352
2020	58.2401504516602
2021	52.9462509155273