Year	% gross
1971	3.51056003570557
1972	4.47421979904175
1973	5.59440994262695
1974	6.03409004211426
1981	12.5920896530151
1984	20.2152099609375
1985	20.5242900848389
1989	14.9384298324585
1990	14.5071096420288
1992	26.445930480957
1999	21.8650493621826
2000	22.8163299560547
2001	23.8308696746826
2007	38.5909194946289
2009	46.5622711181641
2010	43.2904014587402
2011	40.4111785888672