Year	% gross
1971	89.0195007324219
1972	90.5629196166992
1973	91.4142227172852
1974	90.9147186279297
1975	92.1685180664062
1976	95.7928466796875
1977	98.3383865356445
1978	101.266548156738
1979	102.609939575195
1980	104.270050048828
1981	105.58251953125
1982	106.236640930176
1983	105.415756225586
1984	104.130767822266
1985	104.555068969727
1986	104.544097900391
1987	104.121429443359
1988	103.753433227539
1989	103.462211608887
1990	104.258056640625
1991	107.76188659668
1992	109.595031738281
1993	108.040649414062
1996	99.5676574707031
1997	100.766540527344
1999	99.0205001831055
2000	100.551040649414
2001	103.11058807373
2002	105.398719787598
2003	103.50048828125
2004	103.385231018066
2005	102.988227844238
2006	102.693328857422
2007	104.312240600586
2008	101.424911499023
2009	101.624313354492
2010	101.07022857666
2011	100.89427947998
2012	101.07137298584
2013	101.631439208984
2014	100.504531860352
2015	99.7375183105469
2016	96.8556365966797
2017	94.0880584716797
2018	100.678001403809