Year	% gross
1971	16.1450099945068
1972	16.53782081604
1976	19.4217891693115
1977	18.2377109527588
1978	18.0565700531006
1986	23.3603000640869
1987	24.3162899017334
1988	24.4660091400146
1989	25.8890800476074
1990	20.5966701507568
1991	23.2987804412842
1992	25.6189308166504
1993	25.9357891082764
1994	27.1602592468262
1999	35.597038269043
2000	40.7704582214355
2001	39.4245185852051
2002	40.5791282653809
2003	40.9224281311035
2004	43.5620918273926
2005	45.3750495910645
2006	47.5410194396973
2007	48.0742416381836
2009	51.3457298278809
2010	53.1864204406738
2014	58.7584915161133
2016	71.4815979003906
2017	75.9497680664062
2018	80.4303436279297