Year	% gross
1973	8.50314044952393
1974	8.32791996002197
1975	8.55208015441895
1976	11.1691904067993
1977	16.794900894165
1978	14.0749797821045
1979	14.1769104003906
1980	15.5146703720093
1981	18.2740898132324
1982	18.9458904266357
1983	20.7005195617676
1984	22.3411598205566
1985	24.6477394104004
1986	27.0946502685547
1987	29.9905490875244
1988	31.0563106536865
1989	30.8650608062744
1990	30.794849395752
1991	30.5334205627441
1992	31.2030696868896
1993	31.5624198913574
1994	31.0638408660889
1995	31.9642200469971
1996	33.0583114624023
1997	34.4959907531738
1998	44.4347610473633
1999	45.1244697570801
2000	45.5296897888184
2001	45.7885398864746
2002	43.583381652832
2003	43.5369682312012
2004	44.2212982177734
2005	45.2056694030762
2006	47.1828308105469
2007	49.0558090209961
2008	51.2769203186035
2009	53.1981582641602
2010	56.4785308837891
2011	60.3965187072754
2012	65.1718978881836
2013	66.2831878662109
2014	68.70068359375
2015	70.4285430908203
2016	72.8984375
2017	74.6720733642578
2018	76.7138900756836
2019	77.3000793457031
2020	77.9466094970703