Year	% gross
1970	8.582200050354
1971	9.03555011749268
1972	10.1227798461914
1973	10.4113597869873
1974	10.5352401733398
1975	10.8173599243164
1976	11.0120697021484
1977	11.1694498062134
1978	11.3113098144531
1979	11.3416795730591
1981	17.5850105285645
1982	25.5704307556152
1983	33.2983283996582
1984	42.786060333252
1985	47.4586410522461
1986	51.1371612548828
1987	52.3167610168457
1988	54.646671295166
1989	55.7672691345215
1990	48.7738990783691
1991	53.134349822998
1992	47.4251594543457
1993	45.3441009521484
1994	45.6992797851562
1995	47.1607208251953
1996	47.0841217041016
1999	46.3249397277832
2000	46.7338981628418
2001	48.5672607421875
2002	47.6199913024902
2003	44.5241889953613
2012	55.0997314453125
2013	53.9782981872559