Year	% gross
1971	21.7803707122803
1972	21.9017906188965
1973	23.2789402008057
1974	23.8110504150391
1975	23.6113204956055
1978	27.2361698150635
1979	29.0378608703613
1980	28.0721092224121
1981	26.8408393859863
1982	29.0526504516602
1983	29.3739604949951
1984	30.1165504455566
1985	33.3144989013672
1986	33.8368492126465
1987	34.5343589782715
1988	35.5526809692383
1989	37.7189292907715
1990	38.7112998962402
1991	39.8500289916992
1993	45.613639831543
1994	49.0159301757812
1995	55.1279106140137
1996	56.6408500671387
1999	52.4382514953613
2000	52.9611282348633
2001	52.7772789001465
2002	53.7023086547852
2003	54.8873291015625
2004	56.5580101013184
2005	56.5553283691406
2006	56.7540397644043
2007	55.6924209594727
2008	55.8063888549805
2009	58.0512084960938
2010	59.1892395019531
2011	59.7356491088867
2012	61.1873588562012
2013	62.4664993286133
2014	64.2652130126953
2015	66.2414093017578
2016	66.9063186645508
2017	69.9848175048828
2018	68.7299270629883
2019	68.039306640625
2020	68.2202529907227
2021	70.4382934570312