Year	% gross
1970	0.736090004444122
1973	12.9388704299927
1974	16.4157390594482
1975	17.3977108001709
1976	19.2798194885254
1998	48.5494995117188
2000	46.007740020752
2001	46.2246398925781
2007	42.792350769043
2008	40.086799621582
2009	39.4966316223145
2010	32.8299713134766
2011	36.6634902954102
2012	31.7973194122314
2013	30.5330009460449
2014	32.015739440918
2015	35.0260581970215
2016	34.6643714904785
2017	42.0893402099609
2018	45.240291595459
2019	39.37255859375
2021	39.557430267334