Year	% gross
1970	8.61816024780273
1971	9.00870990753174
1972	10.1928596496582
1973	10.7033195495605
1974	10.8304901123047
1975	11.8933801651001
1976	11.7549600601196
1977	11.286319732666
1978	10.7479000091553
1979	10.8651103973389
1981	11.2714700698853
1982	11.2794399261475
1984	12.0831298828125
1986	12.2304000854492
1987	13.0785598754883
1988	13.2802000045776
1989	13.3125801086426
1990	12.7669897079468
1991	12.9777898788452
1992	12.7590198516846
1993	13.7518100738525
1994	14.2420902252197
1995	13.0271196365356
1998	19.8210601806641
2012	37.1345100402832
2018	44.4107818603516