Year	% gross
1972	15.092869758606
1973	16.8416805267334
1975	17.8311100006104
1976	18.3247299194336
1977	19.9757099151611
1978	21.1735496520996
1979	21.2010898590088
1980	23.6503200531006
1981	24.6025905609131
1982	25.3626194000244
1983	24.829610824585
1984	25.2587795257568
1985	24.5706901550293
1986	24.1613807678223
1987	24.5757999420166
1988	23.6547908782959
1989	22.597240447998
1990	22.3054103851318
1991	21.7415199279785
1993	21.7479705810547
1994	18.445240020752
1995	27.0660095214844
1996	28.1661205291748
1999	43.209529876709
2000	36.6189498901367
2001	37.998779296875
2002	37.4236183166504
2004	34.5849685668945
2005	34.4205093383789
2006	36.1624298095703
2007	36.0098495483398
2008	38.5303802490234
2009	38.4306106567383
2010	37.8233795166016
2011	38.6725082397461
2012	38.7867813110352
2013	41.5927581787109
2014	42.9350090026855
2015	42.7830200195312
2016	41.1085815429688
2017	40.2909507751465
2018	39.3374214172363
2019	38.8440017700195
2021	35.4129981994629
2022	34.992000579834