Year	% gross
1971	45.089729309082
1972	45.3806800842285
1973	46.5233688354492
1974	47.7351303100586
1975	57.8516807556152
1976	58.7752914428711
1977	60.4333992004395
1978	61.2290916442871
1979	61.9440803527832
1980	63.6986694335938
1981	63.2658500671387
1982	72.4979629516602
1983	72.6534423828125
1984	73.2200469970703
1986	76.9059524536133
1987	77.9175491333008
1988	73.2719192504883
1992	71.5378723144531
1993	74.9489593505859
1994	76.590087890625
1995	82.2809677124023
1996	87.4975967407227
1997	92.4375610351562
1998	93.5280380249023
1999	100.564521789551
2000	101.520172119141
2001	98.185302734375
2002	97.9495086669922
2003	97.5937271118164
2004	97.0481719970703
2005	96.6965484619141
2006	96.5267333984375
2007	96.6558380126953
2008	97.3021469116211
2010	101.503318786621
2011	101.81990814209
2012	102.334587097168
2013	104.802833557129
2014	105.43293762207
2015	106.386573791504
2016	107.912910461426
2017	108.230567932129
2018	108.786758422852
2019	107.631690979004
2020	107.801231384277
2021	107.486389160156