Year	% gross
1971	41.8369407653809
1972	38.8856086730957
1973	41.1303787231445
1974	42.6970481872559
1975	43.7516708374023
1976	47.0083198547363
1977	48.5461502075195
1978	50.6753387451172
1979	53.8404388427734
1980	58.331901550293
1981	60.1165084838867
1982	61.5576095581055
1983	61.9907188415527
1984	62.5107498168945
1985	63.3226699829102
1986	64.8324127197266
1987	66.0884094238281
1988	68.7406997680664
1989	70.6738662719727
1990	73.1067810058594
1991	75.791130065918
1992	80.4333419799805
1993	84.4129333496094
1994	88.0872802734375
1995	91.1835174560547
1996	93.2644882202148
1997	95.6556396484375
1998	96.7120132446289
2013	97.4148330688477
2014	93.9782333374023
2015	92.3047027587891
2016	91.7486267089844
2017	92.4529571533203
2018	95.5868682861328
2019	99.6266403198242
2020	101.828903198242