Year	% gross
1970	16.6749000549316
1971	17.4263305664062
1972	25.6118507385254
1973	25.9351291656494
1974	25.8277893066406
1975	24.8052806854248
1976	25.1982593536377
1977	25.216869354248
1978	26.6304092407227
1979	26.2204704284668
1980	26.4899997711182
1981	27.3655605316162
1982	27.7728900909424
1983	28.1885204315186
1984	31.7869300842285
1985	32.1406593322754
1986	35.3871688842773
1987	37.0987892150879
1988	40.0037117004395
1989	42.1615180969238
1990	38.7969512939453
1991	43.4665184020996
1992	49.0312118530273
1993	55.1967582702637
1994	58.5255699157715
1995	57.977409362793
1996	58.6433486938477
2013	80.388542175293
2014	80.7100067138672
2015	82.1818466186523
2016	81.8633575439453
2017	81.2698593139648
2018	81.2513122558594
2019	77.5843734741211
2020	75.7348327636719
2021	79.4128875732422