Year	% gross
1971	94.3809432983398
1972	94.1586074829102
1973	93.3289489746094
1974	91.671012878418
1975	91.3327026367188
1976	90.4216384887695
1977	90.3242492675781
1978	89.8135223388672
1979	89.5224227905273
1980	89.088737487793
1981	89.6167373657227
1982	93.5575485229492
1983	95.8472137451172
1984	98.529670715332
1985	98.9633636474609
1986	98.6890411376953
1987	98.8992309570312
1988	99.5427017211914
1989	100.166603088379
1990	100.265762329102
1991	101.181831359863
1992	101.97875213623
1993	103.584381103516
1994	104.706901550293
1995	104.110939025879
1996	104.341300964355
1998	104.562110900879
1999	101.859497070312
2000	101.992736816406
2005	100.25789642334
2006	100.439888000488
2007	101.266807556152
2008	102.266227722168
2009	102.963790893555
2010	102.496223449707
2011	102.817977905273
2012	110.901802062988
2013	111.519577026367
2014	111.855911254883
2015	111.930450439453
2016	111.770286560059
2017	111.802101135254
2018	111.452972412109
2019	110.858299255371
2020	110.079071044922
2021	109.334312438965