Year	% gross
1971	14.5681104660034
1972	16.7644691467285
1973	18.9582901000977
1974	20.3389205932617
1975	21.9397392272949
1976	22.5851497650146
1977	23.3908500671387
1978	28.0966396331787
1979	21.5485000610352
1980	19.9181499481201
1981	18.4937000274658
1982	17.2442893981934
1983	16.6986198425293
1984	17.6424598693848
1985	19.0994491577148
1986	21.4099102020264
1987	23.7514705657959
1988	25.5936508178711
1989	27.2986602783203
1990	27.5819797515869
1991	32.1562385559082
1992	33.1980285644531
1993	37.2722587585449
1994	40.2029190063477
1995	44.2140197753906
1996	50.074031829834
1997	52.0703811645508
1998	52.1361618041992
1999	53.2421493530273
2000	49.7412796020508
2001	47.4559288024902
2002	46.0441093444824
2003	46.6852798461914
2004	47.4040298461914
2005	49.8131103515625
2006	52.8239097595215
2007	56.8212089538574
2008	60.1817092895508
2009	63.0504684448242
2010	66.7259826660156
2011	67.9085083007812
2012	69.9871520996094
2013	73.4378128051758
2014	77.8507537841797
2015	83.3754196166992
2016	84.0875701904297
2017	84.4927978515625
2018	84.5051803588867
2019	83.8964691162109
2020	82.676643371582
2021	82.9742889404297