Year	% gross
1971	7.15785980224609
1972	7.44429016113281
1973	7.6490797996521
1974	8.13764953613281
1975	8.75345039367676
1976	10.5709600448608
1977	12.5503301620483
1978	10.9452600479126
1979	11.5674295425415
1980	11.2486600875854
1981	11.3914203643799
1982	11.5983200073242
1983	12.0066299438477
1984	12.2898397445679
1985	13.7802696228027
1986	12.7903099060059
1987	16.1415100097656
1990	19.779109954834
1991	23.173469543457
1992	23.5444793701172
1993	30.2382793426514
1994	33.4518814086914
1995	36.1944313049316
1996	38.6572494506836
1998	44.0282592773438
1999	45.7186889648438
2015	61.8582000732422
2016	63.2655715942383
2017	64.1698226928711
2018	65.0279083251953
2019	65.9340515136719
2020	67.7980194091797
2021	71.8742980957031