Year	% gross
1971	1.82242000102997
1972	1.61594998836517
1973	2.0530800819397
1974	1.86853003501892
1975	2.05624008178711
1976	2.00171995162964
1977	1.84315001964569
1978	1.23195004463196
1979	1.59548997879028
1980	1.51652002334595
1981	3.37118005752563
1982	3.17982006072998
1983	4.44013023376465
1984	4.3514199256897
1985	3.77975988388062
1986	3.41375994682312
1987	3.35625004768372
2001	9.16956043243408
2003	11.076849937439
2006	9.31112957000732
2008	10.8247098922729
2010	17.1612606048584
2012	17.9019203186035
2015	19.5715103149414
2016	19.1937408447266
2017	18.8150997161865
2018	18.22047996521
2019	18.1497898101807
2020	18.2807502746582
2021	18.9394302368164