Year	% gross
1971	11.6728096008301
1972	13.0324296951294
1973	14.3094501495361
1974	15.0923404693604
1975	15.828929901123
1976	17.8592700958252
1977	18.7034492492676
1978	19.1126899719238
1979	19.8440494537354
1980	20.7874908447266
1981	21.6765403747559
1982	21.6215591430664
1983	22.1693897247314
1984	23.2095394134521
1985	25.0215301513672
1986	26.3829307556152
1987	27.6807403564453
1988	29.6070709228516
1989	31.0666694641113
1990	32.9034996032715
1991	34.8315391540527
1992	38.0685615539551
1993	40.2359390258789
1994	42.8672904968262
1995	46.1729011535645
1996	49.1923789978027
1997	50.9492988586426
1998	53.5619506835938
2007	63.8021202087402
2008	66.1983871459961
2009	67.9915771484375
2010	75.0402526855469
2011	77.2625122070312
2012	79.5471267700195
2013	80.9616012573242
2014	81.0195693969727
2015	82.2563095092773
2016	82.8496932983398
2017	83.8392562866211
2018	85.8698883056641
2019	86.3234329223633
2020	88.7071990966797
2021	93.940071105957