Year	% gross
1971	112.449241638184
1972	113.538887023926
1973	113.676483154297
1974	112.855041503906
1975	112.151092529297
1976	113.738990783691
1977	111.060173034668
1978	107.017272949219
1979	100.847267150879
1980	97.3360900878906
1981	96.5124893188477
1982	95.6092071533203
1983	95.1275024414062
1984	91.8019714355469
1985	91.3321304321289
1986	88.8281402587891
1987	90.4152908325195
1988	90.8396911621094
1989	90.2572631835938
1990	90.2790374755859
1991	91.147087097168
1992	91.8005905151367
1993	92.6275863647461
1994	93.3241806030273
1995	94.3002395629883
1996	94.809440612793
1997	95.8890991210938
1998	97.6177825927734
1999	100.16577911377
2000	102.771560668945
2001	99.074089050293
2002	93.7422103881836
2003	96.6238327026367
2004	96.7742614746094
2005	93.5369415283203
2007	96.4526901245117
2008	97.399787902832
2009	97.5158081054688
2010	97.6362075805664