Year	% gross
1971	31.2613105773926
1972	34.5447807312012
1973	37.2119903564453
1974	40.7169799804688
1975	43.4983711242676
1976	46.5317687988281
1977	50.8737602233887
1978	55.5166511535645
1979	61.1247787475586
1980	69.6458969116211
1981	76.5381469726562
1982	77.3551788330078
1983	78.4879302978516
1984	82.4354476928711
1985	83.6626510620117
1986	84.933723449707
1987	88.30322265625
1988	86.5433807373047
1989	87.9866180419922
1990	88.5025405883789
1991	88.964469909668
1992	89.2677993774414
1993	91.0305480957031
1994	92.8585968017578
1995	94.8950500488281
1996	96.9922027587891
1997	95.5029296875
1998	94.7269592285156
1999	95.2316131591797
2000	98.2106094360352
2001	97.9438171386719
2002	97.4044876098633
2003	97.2058563232422
2004	97.2399368286133
2005	97.5727310180664
2006	96.9087905883789
2007	96.7846374511719
2008	96.407600402832
2009	96.9241409301758
2010	97.3114166259766
2011	97.4617385864258
2012	97.2857513427734
2013	97.6339797973633
2014	98.3530578613281
2015	98.3732299804688
2016	98.453483581543
2017	98.7714462280273
2018	98.8866806030273
2019	97.9251403808594
2020	96.619010925293
2021	97.7996215820312
2022	97.6673965454102