Year	% gross
1970	32.8686103820801
1971	34.6773300170898
1972	36.7936515808105
1973	38.5006103515625
1974	38.8168601989746
1975	39.2668800354004
1976	39.9636688232422
1977	46.0213012695312
1978	53.662281036377
1979	59.9256401062012
1980	63.1746215820312
1981	67.0895385742188
1982	71.1706924438477
1983	70.9554595947266
1984	70.2902221679688
1985	68.9102172851562
1986	63.5321197509766
1987	61.998649597168
1988	58.9216690063477
1989	60.340461730957
1990	60.2254600524902
1991	60.925220489502
1992	63.2206611633301
1993	65.0896682739258
1994	65.9968185424805
1995	65.4101715087891
1996	61.8270797729492
1997	65.1015167236328
1998	67.5578308105469
1999	69.9764099121094
2000	73.3133316040039
2001	74.3173217773438
2002	75.9230194091797
2003	77.1403427124023
2004	79.3112564086914
2005	80.6193618774414
2006	82.0925903320312
2007	80.4986419677734
2008	78.6139221191406
2009	80.5354919433594
2010	81.6875381469727
2011	85.7024307250977
2012	88.3193893432617
2013	89.4652099609375
2014	88.2269134521484
2015	86.9585418701172
2016	85.3424072265625
2017	85.9352188110352
2018	86.3008193969727
2019	87.4866790771484
2020	88.288932800293
2021	88.3477935791016
2022	88.5459823608398