Year	% gross
1971	9.20557975769043
1972	8.72476005554199
1973	8.72758960723877
1974	9.39091968536377
1975	10.3209199905396
1976	11.4549398422241
1977	13.0772895812988
1978	14.7909498214722
1979	15.8441801071167
1980	17.2325992584229
1981	18.2657299041748
1982	18.3034896850586
1983	17.4503307342529
1984	16.3429203033447
1985	15.6798000335693
1986	15.2705297470093
1987	15.6980600357056
1988	16.0499992370605
1989	16.132740020752
1990	16.2146396636963
1991	16.2884407043457
1992	14.6483697891235
1993	14.2413597106934
1994	18.95871925354
1995	20.0404491424561
1996	21.0769901275635
1997	22.8019599914551
1998	23.7565002441406
1999	26.084529876709
2000	29.7583904266357
2001	32.0267791748047
2002	36.8876609802246
2003	39.2078895568848
2004	45.4242782592773
2005	49.1181411743164
2006	49.8811302185059
2007	54.1809005737305
2008	57.9171714782715
2009	61.4115715026855
2010	64.9327697753906
2011	66.7968215942383
2012	66.9287719726562
2013	66.3243179321289
2014	67.3959732055664
2015	67.2303619384766
2016	67.5056381225586
2017	67.7142181396484
2018	66.7902221679688
2019	66.8802185058594
2020	67.1843719482422
2021	69.1061782836914