Year	% gross
1971	6.54086017608643
1972	8.12024974822998
1973	8.73923969268799
1975	9.21588039398193
1997	18.2224502563477
2003	26.1287307739258
2012	37.5093688964844
2014	37.8270111083984
2015	36.6489715576172
2016	39.1859092712402
2017	42.9821395874023
2020	41.3354682922363
2021	38.1502113342285