Year	% gross
1970	5.433189868927
1971	3.69481992721558
1972	5.61823987960815
1973	5.26678991317749
1974	6.50515985488892
1976	11.0616703033447
1977	12.5025701522827
1978	11.9474296569824
1980	10.5492401123047
1981	9.70176982879639
1998	80.2228393554688
1999	80.1015396118164
2001	80.1737213134766
2007	96.6459579467773
2008	98.0660018920898
2009	92.3617172241211
2010	93.8130187988281
2011	90.0451812744141
2012	96.7693176269531
2013	90.4627075195313
2014	87.1084823608398
2015	88.7058792114258
2016	55.0514907836914
2017	92.8580780029297
2018	102.169281005859
2019	107.974403381348
2020	102.154327392578