Year	% gross
1970	11.5156402587891
1974	13.4046001434326
1975	15.1364402770996
1976	15.0290298461914
1977	14.4782495498657
1984	14.571849822998
1986	14.7267904281616
1987	15.9966897964478
1988	16.1008205413818
1989	15.837329864502
1990	14.6698703765869
1991	14.7166795730591
1992	14.4881200790405
1993	15.4925403594971
1994	16.0089893341064
1995	14.7410802841187
1998	22.3464794158936
2012	41.1464004516602
2018	48.3249893188477