Year	% gross
1975	17.8830108642578
1976	28.5389404296875
1977	26.6939296722412
1978	33.6515502929688
1979	30.58251953125
1984	24.2686195373535
2007	82.7160491943359
2008	84.4688568115234
2010	92.8733901977539
2011	95.475456237793
2012	94.5986480712891
2013	92.3920974731445
2014	92.5394515991211
2016	77.8260879516602
2017	76.5458374023438
2018	74.0250701904297