Year	% gross
1971	92.1267471313477
1972	91.8561096191406
1973	94.8933715820312
1974	94.5111770629883
1975	94.3143692016602
1976	94.5180511474609
1977	94.0340805053711
1978	93.5325469970703
1979	92.7236862182617
1980	101.256690979004
1981	101.255699157715
1982	103.932319641113
1983	103.969673156738
1984	103.40796661377
1985	102.842178344727
1986	103.031288146973
1987	103.146347045898
1990	105.475563049316
1991	104.492210388184
1993	104.470138549805
1994	104.327377319336
1995	105.278030395508
1996	104.087097167969
1998	102.175888061523
1999	101.391563415527
2005	101.8740234375
2013	99.455436706543
2014	99.6733779907227
2015	100.299911499023
2016	101.362861633301
2017	101.821441650391
2018	101.256561279297
2019	100.981300354004
2020	100.305793762207
2021	98.3054885864258
2022	96.9717330932617