Year	% gross
1971	43.8965110778809
1972	40.4614791870117
1973	42.9657592773438
1974	44.7806396484375
1975	46.0664215087891
1976	49.5078010559082
1977	51.0088310241699
1978	52.9531097412109
1979	55.9842414855957
1980	60.4721984863281
1981	62.1558303833008
1982	63.2933807373047
1983	63.4809989929199
1984	64.0716171264648
1985	64.7342529296875
1986	65.9943618774414
1987	67.6156311035156
1988	69.6734237670898
1989	71.5289764404297
1990	73.8594818115234
1991	77.0907897949219
1992	80.8800582885742
1993	84.7478332519531
1994	88.3519973754883
1995	91.599967956543
1996	93.6034622192383
1997	96.0267333984375
1998	97.0193481445313
2013	97.6532592773438
2014	94.1345901489258
2015	92.4692764282227
2016	92.0354309082031
2017	92.6132736206055
2018	95.5445404052734
2019	99.4822463989258
2020	101.700500488281