Year	% gross
1971	4.60236978530884
1972	6.50905990600586
1973	7.66519021987915
1974	8.15847015380859
1975	13.0747203826904
1976	19.1437206268311
1979	27.2230091094971
1982	36.2645416259766
1984	38.8390083312988
1985	39.5793304443359
1986	39.8961982727051
1987	37.8566589355469
1988	37.6675987243652
1989	37.5529518127441
1990	37.8329315185547
1991	41.2833595275879
1992	42.9951286315918
1993	42.7095985412598
1994	42.730770111084
1995	43.4065017700195
1996	42.3498497009277
1997	44.8686408996582
1999	45.4237289428711
2000	48.9870910644531
2001	50.9440612792969
2002	52.2864799499512
2003	53.173511505127
2004	54.7055206298828
2005	58.1761589050293
2006	60.0205917358398
2007	61.680118560791
2008	69.4687118530273
2009	73.9470901489258
2010	76.215087890625
2011	76.8749618530273
2012	73.5492172241211
2013	76.4941482543945
2014	74.1911926269531
2015	76.5473022460938
2016	71.3180236816406
2017	69.9975967407227