Year	% gross
1971	99.5898666381836
1972	99.8399429321289
1973	101.926147460938
1974	105.573440551758
1975	109.449630737305
1976	113.503021240234
1977	112.351692199707
1978	108.631416320801
1979	106.591148376465
1980	105.947998046875
1981	107.362747192383
1982	108.573448181152
1983	111.858016967773
1984	114.419647216797
1985	117.310890197754
1986	105.52734375
1987	102.361801147461
1988	97.163948059082
1989	96.2541427612305
1990	96.797492980957
1991	98.4012985229492
1992	97.9672164916992
1993	97.9817962646484
1994	97.8823165893555
1995	99.8542404174805
1996	101.238189697266
1997	100.327697753906
2011	89.5654373168945
2012	90.2069778442383
2013	92.4905700683594
2014	93.2006607055664
2015	93.3736801147461
2016	94.9550704956055
2017	94.2029037475586
2018	88.2562866210938
2019	89.5458374023438
2020	91.1220016479492