Year	% gross
1971	0.280840009450912
1973	0.348390012979507
1977	0.0958200022578239
1978	0.0783599987626076
1979	0.0724999979138374
1980	0.0750200003385544
1981	0.0922499969601631
1982	0.111649997532368
1985	0.126939997076988
1987	0.204610005021095
1992	0.353469997644424
1993	0.390740007162094
1994	0.435479998588562
1995	0.442559987306595
1996	0.461650013923645
1999	0.623350024223328
2000	0.646009981632233
2001	0.642130017280579
2002	0.727970004081726
2003	0.984969973564148
2004	1.21905994415283
2005	1.50230002403259
2006	2.22429990768433
2007	3.16519999504089
2008	3.64827990531921
2009	3.95149993896484
2010	4.7514500617981
2011	5.04203987121582
2012	5.3305401802063
2013	5.70935010910034
2014	6.34957981109619
2015	6.81003999710083
2016	7.38789987564087
2017	7.24044990539551
2018	7.45408010482788
2019	7.30100011825562