Year	% gross
1971	18.6819400787354
1973	18.9172401428223
1979	23.9971504211426
1980	24.6954402923584
1981	26.4395294189453
1982	27.3470802307129
1992	30.3638591766357
1995	31.3079795837402
1996	32.776439666748
1998	30.7580394744873
1999	31.5703601837158
2001	31.6712493896484
2002	34.5348701477051
2003	33.5402412414551
2004	32.969181060791
2005	31.5959606170654
2006	32.0728302001953
2008	32.3530883789062
2009	31.2558097839355
2010	32.7490005493164
2011	34.2169990539551
2012	34.609001159668
2013	37.7550010681152
2014	40.3969993591309
2015	43.0130004882812
2016	45.7080001831055
2017	40.1839981079102
2018	33.4179992675781
2019	35.4339981079102
2020	37.0429992675781
2021	40.3460006713867