Year	% gross
1970	14.0365400314331
1971	15.164719581604
1972	15.3437700271606
1973	15.2512102127075
1974	15.1199398040771
1975	16.1706104278564
1977	17.364860534668
1978	19.6906108856201
1979	23.483699798584
1980	27.8757305145264
1981	20.1354694366455
1982	19.5771503448486
1983	19.7667293548584
1984	22.7101593017578
1985	23.6626396179199
1986	25.9977703094482
1987	29.0522003173828
1988	30.7369403839111
1989	37.0926094055176
1990	35.7723617553711
1991	33.2420082092285
1992	36.2642288208008
1995	34.9320487976074
1996	38.5904083251953
1998	43.0639991760254
1999	50.4825286865234
2000	54.4103393554688
2001	69.2706680297852
2002	74.5708618164062
2003	79.3921432495117
2004	79.4241714477539
2005	79.5500106811523
2006	76.3530731201172
2007	76.6563720703125
2008	78.5654678344727