Year	% gross
1971	17.4224090576172
1972	17.6984901428223
1973	19.41748046875
1974	20.2209205627441
1975	20.3807392120361
1978	24.0298595428467
1979	25.445369720459
1980	25.0032997131348
1981	24.5918598175049
1982	26.6390800476074
1983	27.3860893249512
1984	28.3601894378662
1985	31.0939197540283
1986	31.8163394927979
1987	33.2479209899902
1988	34.4548301696777
1989	36.0025901794434
1990	37.9722785949707
1991	39.2387084960938
1993	45.4761505126953
1994	49.2716903686523
1995	55.4692993164062
1996	57.4932518005371
1999	56.1862907409668
2000	56.201831817627
2001	56.7148895263672
2002	58.1100807189941
2003	59.6124610900879
2004	62.0411491394043
2005	62.8203315734863
2006	63.3717384338379
2007	62.461841583252
2008	62.7642097473145
2009	64.9798431396484
2010	66.8578872680664
2011	67.7034072875977
2012	69.7490615844727
2013	71.7841110229492
2014	74.0397262573242
2015	76.423942565918
2016	77.2435073852539
2017	80.7738189697266
2018	79.1237487792969
2019	79.3044815063477
2020	79.4996032714844
2021	82.6882019042969