Year	% gross
1971	16.5061893463135
1973	20.4985294342041
1975	22.0173492431641
1977	25.3077602386475
1978	25.0090808868408
1979	28.2567596435547
1980	29.3864593505859
1981	31.3899192810059
1982	31.1095600128174
1983	31.7355098724365
1984	32.7027206420898
1986	32.3123893737793
1987	31.5236301422119
1988	30.3012599945068
1989	29.6513404846191
1990	29.8479309082031
1991	31.9903697967529
1993	36.7284317016602
1998	51.9075317382812
1999	55.8246383666992
2000	56.4189186096191
2001	58.3567886352539
2002	63.3003807067871
2003	62.0119590759277
2004	61.512508392334
2005	62.868839263916
2006	61.1350898742676
2007	65.1377792358398
2008	64.095458984375
2009	67.0812377929688
2010	70.1601791381836
2011	70.810546875
2012	72.5504684448242
2013	71.3280029296875
2014	71.263298034668
2015	70.6143188476562
2016	70.4594421386719
2017	69.0059814453125
2018	67.3573684692383
2019	66.9644393920898
2020	67.0692825317383
2021	70.0121078491211