Year	% gross
1971	89.667236328125
1972	91.0997467041016
1973	91.8851318359375
1974	91.3172988891602
1975	92.4426498413086
1976	95.8803176879883
1977	98.2442016601562
1978	101.262977600098
1979	102.677436828613
1980	104.300247192383
1983	106.652770996094
1984	103.64421081543
1985	103.768043518066
1986	103.886901855469
1987	103.607131958008
1988	103.390197753906
1989	103.266403198242
1991	106.948913574219
1992	108.340148925781
1993	106.630561828613
1996	98.8095397949219
1997	99.7223663330078
1999	98.4472198486328
2000	100.121452331543
2001	102.724990844727
2002	104.993659973145
2003	103.082702636719
2004	102.9111328125
2005	102.575729370117
2006	102.085342407227
2007	103.561302185059
2008	100.719329833984
2009	100.906272888184
2010	100.276252746582
2011	100.240859985352
2012	100.65576171875
2013	101.451469421387
2014	99.969612121582
2015	98.8311233520508
2016	95.9016036987305
2017	93.1398391723633