Year	% gross
1971	2.68667006492615
1972	2.69125008583069
1973	2.76293992996216
1974	3.13019990921021
1975	3.42170000076294
1976	3.91140007972717
1977	4.51257991790771
1978	5.07738018035889
1979	5.70031023025513
1980	6.98609018325806
1981	8.20543003082275
1982	19.5320701599121
1983	22.2476406097412
1984	27.9922904968262
1985	34.6953392028809
1986	42.5999908447266
1987	47.5925598144531
1988	52.9171295166016
1989	53.5924110412598
1990	55.8643608093262
1991	58.809700012207
1992	63.2262802124023
1993	71.3965301513672
1994	77.8836898803711
1995	84.7973098754883
1996	85.6155319213867
2013	92.8798065185547
2014	92.8759307861328
2015	94.1686325073242
2016	96.7503433227539
2017	94.8514022827148
2018	93.3413391113281
2019	92.1035995483398
2020	91.6897277832031