Year	% gross
1970	5.53361988067627
1971	5.81146001815796
1972	6.16692018508911
1973	6.50656986236572
1974	6.6472601890564
1975	7.05748987197876
1976	7.17600011825562
1977	7.36500978469849
1978	7.18887996673584
1979	6.76641988754272
1981	12.6481800079346
1982	18.267879486084
1983	24.2121200561523
1984	30.038610458374
1985	33.241771697998
1986	35.3113288879395
1987	37.4410591125488
1988	37.6975288391113
1989	37.6037216186523
1990	39.1697692871094
1991	38.0732307434082
1992	34.0504989624023
1993	32.0044898986816
1994	32.8120307922363
1995	34.6142997741699
1996	35.6917304992676
1999	36.9541511535645
2000	36.9885902404785
2001	38.6068382263184
2002	37.7207298278809
2003	36.0468482971191
2012	50.0958709716797
2013	49.8499183654785