Year	% gross
1970	6.12267017364502
1971	6.19003009796143
1972	6.30964994430542
1973	6.46181011199951
1974	6.89245986938477
1975	7.28673982620239
1976	7.74083995819092
1977	8.22961044311523
1978	8.53067970275879
1979	8.95643997192383
1980	9.40281963348389
1981	9.90727043151855
1982	9.96951961517334
1983	10.5870199203491
1984	10.7970399856567
1985	11.1259098052979
1986	11.7823400497437
1987	12.007360458374
1988	12.4089803695679
1989	12.2154197692871
1990	11.8439998626709
1991	11.9353704452515
1992	11.5951204299927
1993	11.488730430603
1994	12.1100997924805
1995	12.2588901519775
1996	12.0537595748901
1997	8.83485984802246
1998	11.8827199935913
1999	13.8420696258545
2000	15.9755296707153
2001	17.7674903869629
2002	19.2581806182861
2003	20.696460723877
2004	23.3095397949219
2005	26.5155601501465
2006	30.4772396087646
2007	33.4887313842773
2008	36.5243492126465
2009	38.5597381591797
2010	41.9150810241699
2011	45.4518203735352
2012	47.4880714416504
2013	50.296558380127
2014	52.0581016540527
2015	54.5571403503418
2016	57.1494483947754
2017	60.8263816833496
2018	61.6964111328125
2019	63.4341087341309
2020	61.6100387573242