Year	% gross
1971	9.10976028442383
1972	10.0607099533081
1973	10.9632301330566
1974	10.7057695388794
1975	11.3384504318237
1976	12.3316097259521
1977	12.315239906311
1978	13.1392602920532
1979	14.4294204711914
1980	16.3870506286621
1981	18.0648002624512
1983	19.0016002655029
1984	19.3051490783691
1985	19.9326305389404
1987	19.7394104003906
1999	23.0311298370361
2014	38.4756011962891
2015	41.6637382507324
2016	43.8949584960938
2017	46.8549613952637
2018	49.0457992553711
2019	52.2111511230469
2020	54.652530670166
2021	57.2815093994141
2022	55.0669403076172