Year	% gross
1970	0.474169999361038
1971	0.403560012578964
1972	0.365960001945496
1973	0.491649985313416
1974	0.554719984531403
1975	0.490489989519119
1976	0.620459973812103
1977	0.789420008659363
1978	0.860679984092712
1979	0.972559988498688
1980	0.887290000915527
1981	0.955770015716553
1982	0.98497998714447
1983	0.985509991645813
1984	0.924399971961975
1985	1.16905999183655
1986	1.19958996772766
1987	1.36476004123688
1988	1.45375001430511
1989	1.41717004776001
1990	1.17868995666504
1991	1.20421004295349
1992	2.07205009460449
1993	2.18902993202209
1994	2.32609009742737
1995	2.27074003219604
1996	2.3200900554657
1999	1.89664995670319
2000	2.06393003463745
2001	2.26988005638123
2002	2.25671005249023
2003	2.72772002220154
2005	3.49530005455017
2006	3.7163999080658
2012	11.0302000045776
2013	10.563850402832
2014	10.4520902633667
2015	9.68772983551025
2017	10.1464996337891
2018	9.7244701385498