Year	% gross
1971	5.66925001144409
1973	5.32893991470337
1974	5.97636985778809
1975	6.34663009643555
1976	8.59930992126465
1977	11.3323402404785
1978	10.0158395767212
1979	10.6083297729492
1980	11.2834901809692
1981	13.8286399841309
1982	15.6502199172974
1983	17.5433101654053
1984	17.7009506225586
1985	22.3250408172607
1986	24.5450992584229
1987	25.5806694030762
1988	25.8836898803711
1989	25.9051208496094
1991	25.0013809204102
1992	27.5075092315674
1993	30.8096504211426
1994	32.2241287231445
1995	35.3550109863281
1996	34.3479804992676
1997	33.3957405090332
1998	35.5468902587891
1999	34.8101615905762
2000	34.0923500061035
2001	33.8424491882324
2002	34.8943786621094
2003	36.125129699707
2004	38.715030670166
2005	38.4236106872559
2006	37.9505996704102
2008	43.7608909606934
2009	48.6006889343262
2010	50.3811302185059
2011	51.4144706726074
2012	50.9825096130371
2013	53.8400001525879
2014	57.0535888671875
2015	56.0016212463379
2016	55.257381439209
2017	54.4444389343262
2018	53.6625900268555
2019	51.5647315979004
2020	52.6030311584473