Year	% gross
1975	1.81839001178741
1976	2.25172996520996
1977	2.33576989173889
1978	2.4099600315094
1979	2.50196003913879
1981	3.09663009643555
1982	4.95187997817993
1986	6.62714004516602
1990	7.90350008010864
1992	7.37587022781372
1994	7.75262022018433
1997	7.9153299331665
2004	16.7529602050781
2007	21.2691497802734
2010	24.1270008087158
2011	23.1049995422363
2012	23.3419990539551
2013	24.9459991455078
2014	25.0849990844727
2016	24.7929992675781
2017	22.7269992828369