Year	% gross
1971	86.6771087646484
1972	87.3465118408203
1973	87.5491409301758
1974	87.2072372436523
1975	88.1152267456055
1976	90.5705337524414
1977	92.8348083496094
1978	93.2342834472656
1979	93.3109512329102
1980	92.1945037841797
1982	101.620307922363
1983	99.5920791625977
1984	94.9358825683594
1985	92.6512603759766
1986	90.5545425415039
1987	92.3254089355469
1988	90.4655303955078
1989	92.0403671264648
1990	91.0896911621094
1991	90.4167633056641
1992	87.8567199707031
1993	91.0166320800781
1994	93.9547805786133
1995	97.803596496582
1996	101.244979858398
1997	90.7006301879883
1998	84.3059234619141
1999	84.6525802612305
2000	89.3995208740234
2001	94.5851364135742
2002	95.2897491455078
2003	96.0471115112305
2004	95.4745712280273
2005	96.0492401123047
2006	97.459716796875
2007	97.7152786254883
2008	98.0813293457031
2009	97.9063034057617
2010	98.6544189453125
2011	99.4467315673828
2012	99.7749633789062
2013	106.875068664551
2014	106.118507385254
2015	104.810516357422
2016	103.015083312988
2017	102.204696655273
2018	101.514892578125
2019	100.21556854248
2020	99.3292617797852
2021	100.097846984863