Year	% gross
1972	0.152390003204346
1973	0.14614999294281
1974	0.173010006546974
1975	0.192949995398521
1976	0.285540014505386
1977	0.385699987411499
1978	0.518389999866486
1979	0.432529985904694
1980	0.472220003604889
1981	0.554149985313416
1982	0.480269998311996
1983	0.418689996004105
1984	0.467759996652603
1987	0.511539995670319
1988	0.539279997348785
1990	0.591430008411407
1991	0.693210005760193
1992	0.651809990406036
1993	0.563839972019196
1994	0.602989971637726
1995	0.75271999835968
1996	0.84254002571106
1998	1.08359003067017
2011	5.10251998901367
2012	5.71182012557983
2013	6.28398990631104
2014	6.40756988525391
2015	6.64952993392944
2016	7.64488983154297
2017	7.94204998016357
2018	8.72474002838135
2019	9.21693992614746
2020	10.9074096679688