Year	% gross
1970	5.46547985076904
1971	5.18040990829468
1972	6.52873992919922
1973	5.66032981872559
1974	6.12310981750488
1975	8.56412982940674
1976	9.87572956085205
1977	9.24330997467041
1982	10.2730598449707
1983	11.1488800048828
1984	9.27880954742432
1985	6.90393018722534
1986	6.13278007507324
1987	6.26619005203247
1990	6.87062978744507
1991	7.15832996368408
1992	7.72910022735596
1995	9.64509010314941
1997	9.71125030517578
2002	17.2252502441406
2010	13.7919998168945
2011	14.1859998703003
2012	14.8400001525879
2013	14.625
2014	15.3859996795654
2015	14.9499998092651
2016	16.1760005950928
2018	17.193000793457
2019	15.6800003051758
2020	16.6030006408691
2021	17.4029998779297